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why do atoms of the same element always have the same number of protons but sometimes have different mass number? What do you call these atoms?

Sagot :

Answer:

However, some helium atoms have more or less than two neutrons. Atoms with the same number of protons but different numbers of neutrons are called isotopes. Because the number of neutrons can vary for a given element, the mass numbers of different atoms of an element may also vary.