| A | B |
|---|
| three types of particles that make up an atom | proton, neutron, electron |
| positively charged subatomic particle | proton |
| negatively charged subatomic particle | electron |
| neutrally charged subatomic particle | neutron |
| an atom that gains or loses one or more electrons | ion |
| atom that gains an electron | negative ion, anion |
| atom that loses an electron | positive ion, cation |
| two atoms with the same number of protons, but different numbers of neutrons | isotopes |
| the smallest piece of a substance that still has the properties of that substance | atom |
| two or more atoms combined | molecule |
| two or more different types of atoms combined | compound |
| a pure substance that cannot be broken down | element |
| lithium oxide, Li2O, has how many total atoms? | 3 |
| lithium oxide, Li2O, has how many oxygen atoms? | 1 |
| lithium oxide, Li2O, has how many lithium atoms? | 2 |
| How many total molecules are in this equation? 2C + O2 -> 2CO | 5 |
| How many total atoms are in this equation? 2C + O2 -> 2CO | 8 |
| How many different types of atoms are in this equation? 2C + O2 -> 2CO (in words) | two |
| two molecules that have the same formula but different structures | isomers |
| atoms with unstable nuclei (the nucleus can split into 2 separate atoms) | radioactive |
| where electrons are found | energy levels outside the nucleus |
| where protons are found | nucleus |
| where neutrons are found | nucleus |
