1.

What is atomic number , mass number , and atomic mass ?

AnswerΒ»

Atomic massis the weighted averagemassof anatomof an element based on the relative natural abundance of that element's isotopes.

Themass numberis a count of the totalnumber of protons and neutrons in anatom's nucleus

Theatomic numberuniquely identifies a chemical element. In an unchargedatom, theatomic numberis also equal to thenumberof electrons

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