Find the odd one out. Give a reason for your answer.
$Cu, Fe, He and H_{2}$

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Solution

An element is a substance that is made up of only one kind of atom, and cannot be split using any chemical means.
An atom is the smallest particle that represents an element in a chemical reaction.
A molecule is the smallest particle of a material (element or compound) with the properties of that substance and the ability to exist in its free state.
A molecule is made up of two or more atoms of the same or different elements.
Here, Copper, Iron, and Helium are atoms while $H_{2}$ is a molecule.
Hence, the odd one out is $H_{2}$

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