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2.1 Terms

TermDefinition
Matter anything that occupies space and has mass
Mass the quantity of matter an object has
Element substances that cannot be broken down chemically into simpler kinds of matter
atom the simplest particle of an element that retains all of the properties of life
Nucleus makes up the bulk of the mass of an atom(protrons+neutrons)
proton a stable subatomic particle occurring in all atomic nuclei with a positive electric charge
neutron a subatomic particle without a charge
atomic number number of protons in an element
mass number equal to the total number of protons and neutrons
electron negatively charged particles
orbital three dimensional region around the nucleus that indicates the probable location of an eletron
isotope atoms of the same element that have a different number of neutrons
compound made up of the atoms of two or more elements in fixed proportions
chemical bond the active forces that hold atoms together
covalent bond forms when two atoms share one or more pair of electrons
molecule simplest part of a substance
ion an atom or molecule in witch the number of electrons is not equal to the number of protons
ionic bond because positive and negative electric charges attract each other, the sodium ion and the chloride ion attract each other. this attraction is called _________
Created by: Addaleigh