Question

116
(b) Explain the significance of Pauli's Exclusion principle in relation to the
electronic structure of atoms.
(c) Write down the electronic configuration for the ground states of each
of the following (i) Na (Z = 11)
(ii) Ca (Z = 20) (ii) Sc (Z = 21)
(iv) Mg? (Z = 12) ​

Answer 1

According to Pauli one orbitals can accommodate two electron only and for any two electron in atom should have atleast one Quantum number different. It determines the electron shell structure of atom

Answer 2

Explanation:

1. Atoms. The Pauli exclusion principle helps explain a wide variety of physical phenomena. ... In a lithium atom, with three bound electrons, the third electron cannot reside in a 1s state and must occupy one of the higher-energy 2s states instead.

• Ca-1s22s2 2p6 3s2 3p6 4s2
• Na-1s22s2 2p63p1
• Sc-1s22s22p63s23p64s23d1
• Mg-1s22s22p63s2