What are two atoms of the same element with different mass numbers called?

1 Answer
anor277
Dec 13, 2016

You speak of "isotopes......"

Explanation:

All hydrogen nuclei contain the one proton, the one positively charged, massive nuclear particle. This is the "protium isotope", ""^1H. A few hydrogen nuclei contain one proton PLUS one neutron, a massive, neutrally charged particle; this is the "deuterium isotope", ""^2H. And a smaller few hydrogen nuclei contain 2 neutrons, to give the "tritium isotope", ""^3H.

Most elements have a number of different isotopes, some of them with important nuclear properties. The atomic mass reported on the Periodic Table is the weighted average of the individual, elemental isotopic masses. Capisce?

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