Question

Which of the following pairs has the same size?

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

Answer 1

Answer: (C)

$Z{r}^{4+},H{f}^{4+}$

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