Question

One element has atomic weight 39. Its electronic configuration is $1s^2,2s^{2}2p^6,3s^2,3p^{6}4s^1.$ The true statement for that element is:

• A. more I.E
• B. transition element
• C. isotone with ${}_{18}A{r}^{36}$
• D. stable oxide $M_{2}O$

Answer 1

Answer: (D)

stable oxide $M_{2}O$

One element has atomic weight 39. Its electronic configuration is $1s^2,2s^{2}2p^6,3s^2,3p^{6}4s^1.$.

It is potassium and forms monovalent cation $K^{+}$ with valency 1.

Stable oxide $M_{2}O$ or $K_{2}O$ which is basic in nature.

Hence, the correct option is $\text{D}$