What is the difference between $2 H$ and $H_{2}$ ?

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Solution

The structure of $H_{2}$ molecule is H - H

$H_{2}$ is a molecule of hydrogen whereas 2H is two atoms of hydrogen.

$H_{2}$ is molecular hydrogen.it is a molecule of hydrogen that consists of two hydrogen atoms bonded together by one single bond. 2H denotes two moles of elemental hydrogen.it should be noted that elemental hydrogen is not bonded to anything.

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