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Question

An atom has an electronic configuration 2, 8, 5. To which of the following elements, mentioned below with their atomic numbers, it would be chemically similar?

A
F (9)
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B
Na (11)
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C
N (7)
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D
Ar (18)
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Solution

The correct option is C N (7)
Nitrogen has an electronic configuration - 2, 5 and the given atom has configuration 2, 8, 5. Since both these elements have 5 valence electrons, their chemical properties are similar.

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