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13 Cards in this Set
- Front
- Back
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atomic mass
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average mass of particles that are not aranged in a regular patern
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periodic table
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chart of elements
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nucleus
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central core of an atom with protons and most of the time neutrons
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proton
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positivly charge particle in the center of a nucleus of an atom
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neutron
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small partical in a nucleus with no electrical charge
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electron
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negative charged particle that moves around the nucleus of an atom
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atomic mass unit
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unit used to measurethe mass of particles in atoms
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atomic number
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number of protons in the nucleus of an atom
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chemical symbol
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1 or 2 letters that represent a element
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group
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elements on the same row in the periodic table
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family
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elements in the same column in the periodic table
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period
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horizontal row in the periodic tabel
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valence electron
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one of the electrons farthest from the neucleus, involved in chemical reactions
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