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Question

The distribution of electrons of an element is given in the figure below. Identify the element and its valency.​


A
Sodium; valency: 2
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B
Magnesium; valency: 2
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C
Magnesium; valency: 1
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D
Sodium; valency: 1
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Solution

The correct option is B Sodium; valency: 1
Atomic number = Number of protons = 11. So, the element is sodium. Also, the outermost shell has only one electron, and so, the valency of the element is 1.​

Chemistry

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