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8SC atoms

atoms & periodic tab

TermDefinition
Protons positively charged particles in the nucleus
neutrons particles of the nucleus that have no charge
atomic number number of protons in the nucleus of an atom
isotopes atoms that have the same number of protons but have a different number of neutrons
mass number the sum of the protons and neutrons in an atom
atomic mass unit the SI unit used to express the masses of particles in atoms
atomic mass the weighted average of the masses of all naturally occurring isotopes of an element
chemical bonding the joining of atoms to form new substances
chemical bond a force of attraction that holds two atoms together
valence electrons electrons in the outermost energy level of an atom
molecule a neutral group of atoms held together by a force of attraction through the sharing of electrons
chemical reaction process by which one or more substances undergo change to produce one or more different substances
electrons megatively charged particles found in all atoms
model representation of an object or system
nucleus tiny, extremely dense, positively charged region in the center of an atom
electrons couds regions inside an atom where electrons are likely to be found
atom smallest particle into which an element can be divided and still be the same substance
Created by: cynthia_ritter