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Physics 2.3

Composition of matter

TermDefinition
Atom Basic building blocks of all matter
Nucleus Dense central core of an atom, has protons and neutrons
The three subatomic particles Protons, Neutrons, Electrons
Atomic number Number of protons in an atom
Atomic mass Average mass of all isotopes in an element
Mass number Total number of protons and neutrons in the nucleus
Ion Atom that is electrically charged due to gaining or losing electrons
Element Substance that can’t be broken down
Isotope Atoms that have the same atomic number but different mass numbers
Periods rows of elements that have the same number of electron shells around the nucleus
Groups columns of elements that have the same number of valence electrons
The identity of an element is based on the ____ in an atom protons
Created by: 1763
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