Question

Which one of the following pair of elements has similar properties?

• A. 44846
• B. 44885
• C. 21, 33
• D. 13, 31

Answer 1

Answer: (D)

13, 31

Answer 2

The elements $13$ (Aluminium) and $31$ (Galium) both belong to same group i.e., III A. Therefore, both elements have similar electronic configuration of the outermost shell and hence have similar properties. $Al \left(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{1}\right)$ $Ga \left(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{1}\right)$