Question

Which of the following pairs has the same size?

• A. $Z{n}^{2+},H{f}^{4+}$
• B. $F{e}^{2+},N{i}^{4+}$
• C. $Z{n}^{4+},T{i}^{4+}$
• D. $Z{r}^{4+},H{i}^{4+}$

Answer 1

The correct option is A $Z{n}^{2+},H{f}^{4+}$

$H{f}^{4+}$ has the same size as $Z{r}^{4+}$ due to the addition of 14 lanthanide elements before it in which electrons are added into the f-subshell which poorly shield the outer electrons and contraction in size occurs.