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2.1 Terms

matter anything that occupies space and has mass
mass the quantity of matter that an object has
elements substances that cannot be broken down chemically into simpler kinds of matter
atom the simplest particle of an element that contains all the properties of that element
nucleus makes up the mass of the atom and is made up of protons and neutrons
atomic number the number of protons in an atom
mass number the total number of protons and neutrons in an atom
electrons small negatively charged particles
orbital a 3D region around a nucleus that indicates the probable location of an electron
isotopes atoms of the same element that have a different number of neutrons
compounds made up of atoms of two or more elements in fixed proportions
chemical bonds the attractive forces that holds atoms together
covalent bond forms when two or more atoms share one or more pairs of electrons
molecule the simplest part of a substance that retains all the properties of that substance and can exist in a free state
ion an atom or molecule with an electric charge
ionic bond the attraction of positive and negative charges that bring each other together, just like oppositely charge ions attract each other
proton a particle that has a positive charge
neutron a particle that has no charge
Created by: WalshC20



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