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A third hydrogen atom cannot join an H2 molecule to form an H3 molecule because the H2 molecule is already at its lowest energy state, known as the ground state. The two hydrogen atoms in an H2 molecule are held together by a strong covalent bond, and adding a third hydrogen atom would require breaking this stable bond, which would require more energy than is available. Additionally, the formation of an H3 molecule would violate the octet rule, as hydrogen can only have a maximum of two electrons in its valence shell.

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7mo ago

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