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Variation of Valency

An atom has e...

Question

An atom has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)
N (7) F (9) P (15) Ar(18).

A

F

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B

N

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C

P

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D

Ar

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Solution

The correct option is A F
The atomic number of the given element is 17 which is chlorine. It would be chemically similar to Fluorine (F) whose atomic number is 9, with the configuration 2, 7.

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