Question

Which of the following explains the sequence of filling electrons in different subshells?
A) Hund's rule
B) Aufbau principle
C) Pauli’s principle
D) All of these​

Answer 1

Answer:

Aufbau principle

Explanation:

The octet rule is used to explain the stable configuration attained by sharing electrons in covalent compounds.

Hund's rule says that all the degenerate states must be singly filled with the same spin before any pairing.

Aufbau's principle describes the order for filling of orbitals from lower energy to higher energy.

Answer 2

Answer:

Aufbau principle is the answer