Four elements A (with one valence electron), B (with three valence electrons), C (with five valance electrons) and D (with seven valance electrons) are lying in the second period of periodic table. Which of the following does not exist at room temperature?A. `C_(2)`B. `A_(2)`C. `D_(2)`D. None of these

Four elements A (with one valence electron), B (with three valence ele

1.	Four elements A (with one valence electron), B (with three valence electrons), C (with five valance electrons) and D (with seven valance electrons) are lying in the second period of periodic table. Which of the following does not exist at room temperature?A. `C_(2)`B. `A_(2)`C. `D_(2)`D. None of these
Answer» Correct Answer - B

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