Question

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ?
(At. no. Z = 22)

• A. 3s ,3p ,3d ,4s
• B. 3s ,3p ,4s, 3d
• C. 3s, 4s, 3p ,3d
• D. 4s ,3s, 3p, 3d

Answer 1

Answer: (B)

$Ti(22)=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^2$
order of energy is 3s 3p 4s 3d