Physical Chemistry: Thermodynamics, Structure, and Change

Published by W. H. Freeman
ISBN 10: 1429290196
ISBN 13: 978-1-42929-019-7

Foundations - Topic A - Matter - Discussion Questions - Page 23: A.1


The neuclar atomic model deescribes an atom as protons and neutrons concentrated in a nucleus and electrons revolving around it in orbitals. The atomic number, Z is the number of protons in an atom. The nucleon number A or atomic mass number is the sum of protons and neutrons of the atom.

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