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class="post-217 post type-post status-publish format-standard has-post-thumbnail hentry category-explicacoes category-quimica category-resumos tag-carga-eletrica tag-eletrons tag-neutrons tag-protons tag-quimica-2 tag-resumo">

Noções Elementares da Estrutura do Átomo

Química

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Química

O átomo é um sistema descontínuo (isto é, predominam os espaços vazios) formado por um núcleo extremamente pequeno e pesado, o qual é dotado de cargas elétricas positivas. Em torno do núcleo, guardando uma certa distância, giram diminutas cargas elétricas negativas que constituem a eletrosfera.

Esquema de átomo:
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A ideia de átomo indivisível já não tem mais sentido, pois ele é constituído de duas regiões distintas: núcleo e eletrosfera. E cada uma dessas regiões é formada por partículas ainda menores, conforme você vê no esquema abaixo:
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Prótons: Partículas que apresentam carga elétrica positiva, unitária (+1) e massa também unitária (1). Estes valores são relativos e servem para comparação com a carga e a massa do elétrons e do nêutron.

Nêutrons: partículas sem carga elétrica, de massa praticamente igual à do próton.

Elétrons: Partículas que apresentam carga elétrica negativa, unitária (-1), massa reduzida, ou seja, 1.840 vezes menor que a do próton. Nestas condições, a massa do elétron é considerada desprezível em relação à massa do próton.

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Desta forma podemos fazer um esquema mais completo de átomo:

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Qual o tamanho de um átomo?
A nossa inteligência naturalmente tende a não aceitar medidas que fogem ao nosso campo visual, sejam elas infinitamente pequenas ou infinitamente grandes. Por isso, lançamos mão de algumas comparações que ajudarão a visualizar tais medidas.
O diâmetro do átomo é da ordem de 10-8 cm, ou seja, 0,00000001 cm,

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Se contarmos os átomos enfileirados no fio de uma régua de 10 cm, teremos 1 bilhão de átomos em uma única carreira.
1 bilhão = 1.000.000.000

Embora o átomo seja assim pequeno, seu núcleo é ainda muitas vezes menor. O diâmetro do núcleo é da ordem de 10-12 a 10-12 cm.

ou seja, o átomo é 100.000 vezes maior que seu próprio núcleo.
Para que você tenha ideia desta relação, observe o exemplo:
se pudéssemos comprimir os átomos enfileirados no fio da régua, no exemplo anterior, até que os núcleos se encontrassem, eles ocupariam um comprimento de apenas 0,01 mm (um centésimo de milímetro).

guarde bem isso:
”toda matéria é formada por átomos!”

Sim, toda matéria é formada de átomos, e todos os átomos são formados de prótons, nêutrons e elétrons. Então, seria correto concluir que todos os átomos são iguais?
Não. Os átomos diferem entre si pela quantidade de prótons, nêutrons e elétrons. Veja:

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Observe estes destaques:

-Para cada espécie de matéria poderemos ter várias espécies de átomos com certo número de prótons, nêutrons e elétrons.
-Para identificar uma espécie de átomo o número de nêutrons não é importante, visto que eles só contribuem para a massa do átomo.
– Os prótons, com sua carga positiva, é que vão dar a identidade do átomo.
-Essa quantidade de prótons, que nos dá a identidade do átomo, é denominada número atômico, simbolizado por z.

Z= Número atômico = quantidade de prótons.

É importante considerarmos também a massa do átomo, que é representada pelas partículas nucleares: prótons e nêutrons, já que a massa dos elétrons é desprezível. À soma do número de prótons e nêutrons de um átomo chamado número de massa, simbolizado por A.

A= Número de massa= Quantidade de prótons + nêutrons

Portanto, completando as informações nos exemplos citados, temos:

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Vamos destacar:

Como você deve ter observado em todos os exemplos acima, sempre ocorre o seguinte:
– O número de elétrons é igual ao número de prótons.
-a carga elétrica de um próton (+1) anula a carga elétrica de um elétron (-1), fazendo com que o átomo seja um sistema eletricamente neutro.
– O número de nêutrons não é necessariamente igual ao de prótons; pode ser igual ou maior.
– O único átomo que não apresenta nêutrons é o do H (Z = 1, A = 1).

Atenção para o resumo:

Z = P
A = P + N
N = A – Z
A = Z + N

Fonte; Livro Química (Antônio lembo e Antônio Sadella)

Postado por Karen Alves

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Explicações, Química, Resumos
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4 Thoughts to “Noções Elementares da Estrutura do Átomo”


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    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007
    Neves Manuel Sousa

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Gostei bastante de ver está matéria, ajudou-me muito naquilo que eu estava pesquisando.
    Obrigado


  2. Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007
    Luís Alberto N'sona

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    As informações que encontrei nesta página são meramente sólidas e cientificamente aprovadas. Obrigado!


  3. Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007
    riri

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Começa muito mais depois fica meio complicado


  4. Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007
    filomeno alfredo

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

    gostei muito desta matéria e ajudou-me obrigado


Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

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Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Deixar comentário


Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007


Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007


Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007

Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in /home/resumoescolar/www/wp-includes/wp-db.php on line 2007