What charge do electrons have?

An atom has 5 protons and 6 neutrons. What is its atomic mass?

An atom has 12 protons. What number will it be on the periodic table?

C-12, C-13 and C-14 are _________________ of each other

Atoms which have the same number of protons but different numbers of neutrons are called what?

__________ combine 2 or more elements in specific ratios that cannot be broken down by physical means.

Covalent bonds ____________ electrons and ionic bonds ____________ electrons

What kind of weak force holds slightly positive and negative molecules together?

Hydrochloric acid reacts with sodium hydroxide to make sodium chloride and hydrogen gas. A product of this reaction is .......

An endothermic reaction ____________ energy in the form of heat

The energy needed to start a reaction is called ......