Question

Question 14

The electronic configurations of the elements A, B and C are given below. Answer the question 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 $1s^2$ $2p^6$ $2p^6$ $3s^2$ $3p^5$

Stable form of A may be represented by the formula

(a) A

(b) $A_2$

(c) $A_3$

(d) $A_4$

Answer 1

Answer: (a). A.

The stable form of electronic configuration is $n{s}^{2}n{p}^6$. A represents noble gas because the octet is complete.

A is Neon which has the atomic number 10, the electron configuration is, $1s^2$ $2s^2$ $2p^6$.