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Chemistry, 31.03.2020 00:25 22haydeabiy

An atom of an element has 54 protons. Some of the elements atoms have 77 neutrons, while other atoms have 79 neutrons. What are the atomic numbers and mass numbers of the two types of atoms of this element?

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An atom of an element has 54 protons. Some of the elements atoms have 77 neutrons, while other atoms...

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