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Abundance and Isotopes

Why does hydr...

Question

Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?

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Solution

Hydrogen has an electronic configuration of $1 s^{1}$ . Its outer shell is not complete. So, hydrogen forms covalent bond with another hydrogen atom which results in complete filled shell of electrons which is much more stable than half filled shell.
Hence, hydrogen occurs in a diatomic form rather than in a monoatomic form under normal condition.

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Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?

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Q. Assertion :In atomic form hydrogen consists one proton and one electron. Reason: In elemental form hydrogen exists as a diatomic molecule and is called dihydrogen.

Q. Two moles of monoatomic gas is expanded from

(P_{0}, V_{0})

(P_{0}, 2 V_{0})

under isobaric condition. Let

Δ Q_{1}

be the heat given to the gas

Δ W_{1}

the work by the gas and

Δ U_{1}

the change in internal energy Now the monoatomic gas is replaced by a diatomic gas. Other conditions remaining the same. The corresponding values in this case are

Δ Q_{2}, Δ W_{2}, Δ U_{2}

respectively, then:

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