What are the spins of electrons in Helium atom? – InterviewSolution

1.

What are the spins of electrons in Helium atom?

Answer»

The quantum numbers for two electrons of Helium are given below as per Pauli’s exclusive principle.

Orbital	n	l	m_l	m_s
First electron	1	0	0	+ 1/2
Second electron	1	0	0	- 1/2

Three of quantum numbers are same. So fourth must be different so the two electrons have anti-parallel spins.

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