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Q.

Four elements A (with one valence electron), B (with three valence electrons), C (with five valence electrons) and D (with seven valence electrons) are lying in the second period of periodic table. Which of the following does not exist at room temperature?

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a

C2

b

A2

c

D2

d

None of these

answer is B.

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Detailed Solution

Li is the elements with one valence electron, B is the element with three valence electron, N is the elements with five valence electron, F is the elements with seven valence electron.
Li does not exist at room temperature.

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