| A | B |
|---|
| acid | a substance that donates protons, H+ to form hydronium ions, H3O+, when dissolved |
| alkali metals | the most highly active family of metals |
| alkaline-earth metals | the reactive metal containing 2 valence electrons |
| alpha particle | a positively charged particle, emitted by some radioactive nuclei, that consists of two protons and two neutrons |
| anion | an ion with a negative charge |
| atom | the smallest particle that has the properties of an element |
| atomic number | the number of protons in the nucleus of an atom |
| cation | an ion with a positive charge |
| chemical change | a change that occurs when a substance changes composition by forming one or more new substances |
| chemical property | the way a substance reacts with others to form new substances with different properties |
