Y8 Atoms and elements

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13 Terms

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Atomic Mass
average mass of all of the protons and neutrons in an atom
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atomic number
number of protons in an atom's nucleus
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chemical symbol
an abbreviation below the atomic number containing one or two letters
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atoms
Building blocks of matter made up of protons, neutrons, and electrons
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element
A pure substance made of only one kind of atom
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proton
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
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neutron
A subatomic particle that has no charge and that is found in the nucleus of an atom
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electron
A subatomic particle that has a negative charge
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nucleus
The center of an atom, containing the protons and neutrons
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atomic number
the number of protons in the nucleus of an atom
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atomic mass
Number of protons and neutrons
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shells
Energy levels where the electrons are found
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valence electrons
electrons in the outermost shell