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chapter 2 section 1

composition of matter

TermDefinition
matter anything that takes up space or 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 part of an element that retains all of the properties of that element
nucleus the central region - makes up the bulk of the mass of the atom and consists of two kinds of subatomic particles, proton and neutron
proton a positively charged particle in the nucleus
neutron the particle that has a mass greater that a proton and has no charge
atomic number the number of protons in an atom
mass number equal to the total number of protons and neutrons of the atom
electron small negatively charged particles of the atom
orbital a 3D region around a nucleus that indicates the probable location of an electron
isotope atoms of the same element that have a different number of neutrons
compound made up of atoms of two or more elements in fixed proportions
chemical bond the attractive forces that hold atoms together
covalent bond form when two atoms share one or more pairs of electrons
molecule is the simplest part of a substance that retains all of the properties of that substance and can exist in a free state
ion an atom or molecule with an electrical charge
ionic bond the attraction between positive and negative electrical charges
Created by: campbellm19
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