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Ch. 2 Section 1

Section 5

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
atom simplest particle of an element that contains all the properties
nucleus central region of a cell
proton positive charge
neutron no charge
atomic number number of protons in an atom
mass number equal to total number of protons and neutrons
electron negative charge
orbital 3D region around the nucleus that indicates the probable location of the electron
isotope atoms with a different number of neutrons
compound atoms of 2 or more elements
chemical bond attractive forces that hold atoms together
covalent bond when 2 atoms share 1 or ore pairs of electrons
molecule simplest part of a substance that retains all the properties of that substance and can exist in a free state
ion atom or molecule with an electrical charge
ionic bond the positive and negative attraction
Created by: zhaberstich