| A | B |
|---|
| Element | substance that cannot be chemically broken down into simpler substances |
| Atom | smallest part of an element that can be identified as that element |
| Nucleus | center, or core, of an atom |
| Proton | particle that has a positive charge and is located outside of the nucleus |
| Neutron | particle that has a neutral (no charge) chargean and is located in the nucleus |
| Electron | particle that has a negative charge and is located outside the nucleus |
| Atomic Number | number of protons in the nucleus |
| Atomic Mass | total mass of the protons and neutrons in in an atom, measured in atomic mass units (amu) |
| Mass Number | number of protons and neutrons in the nucleus of an atom |
| Energy Level | place in an electron cloud where an electron is most likely to be found |
| Analyze | To study the relationship of the parts of something. |
| Orbit | To revolve around. |
