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matter anything that occupies space and has mass
mass the quantity of matter an object has
elements substances that cannot be broken down chemically into simpler kinds of matter
atom the simplest particle of an element that retains all the properties of that element
nucleus the central region of a cell
proton positively charged particles
atomic number the number of protons in an atom
mass number equal to the total number of protons and neutrons
electrons negatively charged particles
orbital a three-dimensional region around the nucleus that indicates the probable location of an electron
isotopes atoms that have a different number of neutrons
compounds atoms of two or more elements in fixed proportions
chemical bonds the attractive forces that hold elements together
molecule the simplest part of a substance that retains all the properties of that substance and can exist in a free state
covalent bond when two atoms share one or more pairs of electrons
ion an atom or molecule with an electric charge
ionic bond when positive and negative electrical charges attract and form a compound
Created by: taylorwagner