Heisenberg’s uncertainty principle says that you cannot know the momentum or the position of an electron exactly.

If you want to know the number of protons in an atom of a given element, you must look up its

In the notation , the 4 refers to the

When balancing a chemical equation, you need to change subscripts to make the number of atoms of an element the same on both sides of the equation.

Atoms gain or lose electrons in chemical reactions in order to increase their energy state.

J.J. Thomson discovered that cathode rays were really a stream of electrons.

Temperature is a measure of the amount of heat stored in a substance.

The subscript “2” in Mg(OH) tells you that the charge of the hydroxide ion is (-2).

In combination reactions, elements react to form compounds.

The breaking and making of chemical bonds explains chemical reactions and energy flow.