Answer :
A sample composed only of atoms having the same atomic number is classified as element.
A sample composed only of atoms having the same atomic number is classified as " element".
What is element?
A pure substance made up entirely of atoms with almost the same number of protons in respective nuclei was known as an element.
What is atoms?
Atoms are "the fundamental building components of matter," according to Wikipedia. It is the lowest fundamental unit of matter which thus possesses chemical element qualities.
A sample composed only of atoms having the same atomic number is classified as " element".
Therefore, the correct answer will be option (3).
To know more about atom and element.
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