\[N{{a}^{+}}\]ion is isoelectronic with [CPMT 1990]

• A.        \[L{{i}^{+}}\]     
• B.        \[M{{g}^{+2}}\]
• C.        \[C{{a}^{+2}}\] 
• D.        \[B{{a}^{+2}}\]