Question

Match the column I and column II

$\begin{array}{cc}\text{COLUMN I}& \text{COLUMN II}\\ \text{1. Isobar}& \text{(i) Becquerel}\\ \text{2. M-shell}& \left(ii\right)K_{19}^{10},A{r}_{18}^{40}\\ \text{3. Radioactivity}& \left(iii\right)18\end{array}$

• A. 1-(i),2-(ii),3-(iii)
• B. 1-(ii),2-(iii),3-(i)
• C. 1-(iii),2-(ii),3-(i)
• D. 1-(i),2-(iii)3-(ii)

Answer 1

The correct option is B

1-(ii),2-(iii),3-(i)

Radioactivity was first observed by scientist Becquerel, M shell where n $=3is2\times 3^2=18$ ,it can accommodate 18 electrons. Isobars are defined as atoms having the same mass number but different atomic number are called as isobars, the above give in column are examples of isobars.