Question

Which of the following atom pair have the same structure?

• A. $He,N{e}^{+}$
• B. $L{i}^{+},N{a}^{+}$
• C. $N,C$
• D. $B,Li$

Answer 1

Answer: (B)

$L{i}^{+},N{a}^{+}$

Out of all these options, only ${Li}^{+}$ and ${Na}^{+}$ have a similar electronic configuration, both ions of the elements the First Group of periodic table, ie the alkali metal and have lost exactly 1 electron from their outermost shell to achieve a stable noble gas electronic configuration, therefore have similar structure.