Why do the gases He, Ne, and Xe tend to be monatomic rather than diatomic?

Physical Chemistry
2nd Edition
ISBN:9781133958437
Author:Ball, David W. (david Warren), BAER, Tomas
Publisher:Ball, David W. (david Warren), BAER, Tomas
Chapter13: Introduction To Symmetry In Quantum Mechanics
Section: Chapter Questions
Problem 13.11E
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Why do the gases He, Ne, and Xe tend to be monatomic rather than diatomic?

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Every atoms wants to be stable. To gain stability, atoms need to achieve an stable electronic configuration, which is an octet. To have an octet, atoms react with other atoms of same or different kinds forming chemical bonds, and then become diatomic, or triatomic etc. A monoatomic molecule consists of just one atom, and a diatomic molecule consists of two atoms and so on.

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