As per the given scenario, the sample can be any of the following, except element. The correct option is C.
What is an element?
A substance that is unable to broken down chemically into smaller molecules.
An element is made up of atoms with the same atomic number, which means that each atom possesses the same count of protons in its nucleus as the other atoms in the element.
A chemical compound is a chemical substance made up of many identical molecules made up of atoms from multiple elements that are held together by chemical bonds.
A molecule made up of only one element's atoms is thus not a compound.
A scientist discovers three types of atoms in a sample of matter. Except for elements, the sample can be any of the compound, molecule or mixture.
Thus, the correct option is C.
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