Chemistry Vocabulary

a substance made up of atoms of two or more different elements joined by chemical bonds

a change in matter that creates one or more new substances

a combination of chemical symbols and numbers to represent a substance

a group of atoms bonded together

color change, light created, temperature, bubbling, precipitate formed

smallest particle of an element

particle of an atom's nucleus that can be found by subtracting atomic number from atomic mass

number of protons and neutrons

the number of protons in the nucleus of an atom

positively charged particle of an atoms nucleus

a change in matter that does not change its identity

a pure substance made of only one kind of atom

a number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound

a one or two letter representation of an element

a combination of two or more substances that are not chemically combined

negatively charged particle that orbits the nucleus of an atom

number in front of a chemical formula that indicates how many molecules and atoms there are