| A | B |
|---|
| acid | A substance that tastes sour, has a pH of less than 7, and turns blue litmus paper red. These substances give hydrogen ions to water. |
| proton | Positive subatomic particles that are found in the nucleus. |
| neutron | Neutral subatomic particles that are found in the nucleus. |
| electron | Negative subatomic particles that are found outside the nucleus. |
| atomic number | The top number in the square on the periodic table. This number tells you how many protons are in the atom. |
| atomic mass | The bottom number in the square on the periodic table. This number tells you how many neutrons and protons are in the atom. |
| base | A substance that tastes bitter, is slippery, has a pH of more than 7, turns red litmus paper blue, and takes hydrogen off water. |
| neutral | Not positive or negative. |
