An atom with electronic configuration 2,8,5 will be similar to _________.

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Ar(18)

Na(11)

N(7)

F(9)

answer is C.

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Detailed Solution

An atom with electronic configuration 2,8,5 will be similar to N(7).
In the modern periodic table, the elements are arranged in increasing order of their atomic numbers.

The electronic configuration of the given elements are: F- 2,7 ; Na- 2,8,1 ; N- 2,5 ; Ar -2,8,8 .

Nitrogen here has 5 electrons in its outermost shell.

So, the given atom will be similar to nitrogen.

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