AP Biology: Chemistry
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| 168732597 | element | a substance that cannot be broken down into any other substances | |
| 168732598 | electron cloud | a three-dimensional space that electrons travel freely | |
| 168732599 | covalent bond | a bond that is formed when atoms share electrons | |
| 168732600 | molecule | two or more atoms held together by shared electrons | |
| 168732601 | ions | charged atoms | |
| 168732602 | ionic bond | a bond in which positive and negative ions are attracted to each other | |
| 168732603 | acid | a chemical that donates protons when dissolved in water | |
| 168732604 | base | a chemical that accepts protons (H+ ions) when dissolved in water | |
| 168732605 | catalyst | a substance that changes the speed of a reaction without being affected itself | |
| 168732606 | nucleotide | a monomer that forms nucleic acid |