Question

Given an element, why don't ALL the atoms of this element have the same mass?

Answer 1

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Because of the different number of protons and neutrons and thereby electrons and therefore they differ in chemical and physical properties

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Answer 2

Answer:

Atoms of the same element can have different masses because the number of neutrons can vary for different isotopes of a given element. They will still have the same number of protons, though, because that is what identifies them as being a particular element.A sodium atom is different from a carbon atom.