Question

The total number of electrons present in all the s orbitals, all the p orbitals and all the d orbitals of caesium ion are respectively:

• A. 6, 26, 10
• B. 10, 24, 20
• C. 8, 22, 24
• D. 12, 20, 23

Answer 1

The correct option is B 10, 24, 20

Atomic number of Caesium- 55

Electronic configuration of Caesium- $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^{6}6s^1$

Electronic configuration of Caesium ion- $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^6$

Electrons in s orbitals- 10

Electrons in p orbitals- 24

Electrons in d orbitals- 20