Question

If an atom has electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{3}4s^2$, it will be placed in:

• A. second group
• B. third group
• C. fifth group
• D. sixth group

Answer 1

The correct option is C fifth group

The outermost shell and one shell prior to it in d subshell, has total 5 electron so it will be placed in fifth group in transition element or 'd' block of periodic table.