Verified Answer :

b, sodium because if you look at your periodic table it is the only element not compounded with another

Among the given ones, sodium is not a compound. The correct option is b.

What is a compound?

The substance that is formed by union of different elements is referred to as a compound.

For instance, salt is made up of sodium and chloride, water have hydrogen and oxygen, etc.

Thus, the correct option is b.

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