The smallest among the following ion is:

Question

The smallest among the following ion is: (A)  Mg2+  (B)  Na+  (C)  Ba2+  (D)  Al3+

Tardigrade Admin · Accepted Answer

As we move from left to right in a period, the atomic size of elements decrease, hence among Na, Mg and Al, Al will be smallest. Further atomic size decrease with increase in oxidation number. Hence Al3+ ion is quite smaller than other three ions as it has maximum positive charge (+ 3).

Q. The smallest among the following ion is:

$M g^{2 +}$

$N a^{+}$

$B a^{2 +}$

$A l^{3 +}$

As we move from left to right in a period, the atomic size of elements decrease, hence among Na, Mg and Al, Al will be smallest. Further atomic size decrease with increase in oxidation number. Hence $A l^{3 +}$ ion is quite smaller than other three ions as it has maximum positive charge (+ 3).