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Big 20 Periodic Tble

TermDefinition
atom smallest particle into which element can be divided and still be same substance
electron clouds regions inside and atom where electrons are likely to be found
mass number sum of protons and neutrons in an atom
molecule group of atoms held together by attraction force sharing electrons
molecule smallest unit of compounds
exothermic physical or chemical change in which energy is released
endothermic physical or chemical change in which energy is absorbed
covalent bond bond formed from two or more nonmetals(electrons shared
protons positively charged particles of the nucleus
atomic mass weighted average of masses of all naturally ocurring isotopes of an element
electrons negatively charged particles found in all atoms
neutrons particles of the nucleus of an atom that have no charge
valence electrons electrons in the outermost energy level of an atom
nucleus tiny extremely dense positively charged region in center of atom
atomic number number of protons in the nucleus of an atom
ionic bond bond formed between metals and nonmetals
period horizontal row of elements on periodic table
group/family column of elements on periodic table
Law of conservation of mass mass is neither created nor destroyed in ordinary physical and chemical changes
Law of conservation of energy energy is neither created nor destroyed
Created by: cynthia_ritter
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