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  • Stable form of A may be represented by the formula (i) A (ii) A2 (iii) A3 (iv) A4

The electronic configurations of three elements A, B and C are given below.
Answer the questions from 14 to 17 on the basis of these configurations.
A 1s^{2} 2s^{2} 2p^{6}
B 1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}
C 1 s^{2}2s^{2}2p^{6}3s^{2}3p^{5}

Stable form of A may be represented by the formula
(i) A
(ii) A2                    
(iii) A3                   
(iv)  A4

Answers (1)

The answer is the option (i) A

Explanation: The formula will be A only, as the octet of A is complete. It has an atomic number of 10.

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