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Atoms/Periodic Table

TermDefinition
atomic number Number of protons and electrons in an atom
atomic mass total weight of protons and neutrons (protons + neutrons)
atom smallest unit of matter
neutron A subatomic particle that has no charge and that is found in the nucleus of an atom
proton A subatomic particle that has a positive charge and that is found in the nucleus of an atom
electron A subatomic particle that has a negative charge
electron cloud mostly empty space; area outside the nucleus where electrons are found
valence electron an electron found on the outermost shell of an atom
groups the vertical columns on the periodic table
period the horizontal rows on the periodic table
covalent bond when two nonmetals react, atoms share electrons
ionic bond when a metal element reacts with a non-metal element, their atoms gain and lose electrons
ion an atom carries a positive or negative charge
isotopes atoms of the same element can differ in the number of neutrons
Created by: sdrogers
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