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13 Cards in this Set

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The average mass of one atom of an element
atomic mass
A unit used to measure the mass of particles in atoms
atomic mass unit (amu)
The number of protons in the nucleus of an atom
atomic number
A tiny, negatively charged, high-energy particle that moves around the nucleus of an atom
electron
Elements in the same vertical column of the periodic table
family
Elements in the same vertical column of the periodic table
group
Small uncharged particles in the nucleus of an atom
neutrons
The central core of an atom containing protons and usually neutrons
nucleus
Elements in the same horizontal row of the periodic table
period
A chart of the elmetns showing the repeating pattern of their properties
periodic table
Samll, positively charged particles in the nucleus of an atom
protons
The elecrons that are farthest away from the nucleus of an atom and are invloved in chemical reactions
valence electrons
A one- or two-letter representation of an element
chemical symbol