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Chapter 4 Vocabulary: Atomic Structure

Atom The smallest particle of an element that retains the properties of that element.
Electron Negatively charged subatomic particle.
Proton Postively charged subatomic particle.
Nucleus The centeral core of an atom, composed of protons and neutrons
Atomic Number An element is the number of protons in the nucleus of the atom of that element.
Mass Number Total number of protons and neutrons in the nucleus.
Isotopes Atoms that have the same number of protons but different numbers of neutrons.
Atomic Mass Unit (amu) one-twelfth the mass of a carbon-12 atom
Atomic Mass An element that's the weighted average mass of the atoms in a naturally occuring sample of the element.
Created by: KellyBeck