The mass of an atom expressed in atomic mass units * O atomic mass
O atomic mass unit
O atomic number
O mass number
O isotope

10. the kinetic theory of matter states that atomic particles will move if the temperature is above the freezing temperature of water atomic particles bounce off each other one time in their life atomic particles are constantly bumping off each other because particles are in direct contact with each other at all times all matter is made up of atomic particles which are in constant random motion