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Flashcards 7
Mrs. Lopes
| Term | Definition |
|---|---|
| Atom | An atom is the smallest unit of matter that makes up everything around us. |
| Group/Family | Up and down, similar characteristics. |
| Period | Rows, no similar characteristics. |
| Nucleus | Center of the atom (house). |
| Neutron | Inside the nucleus, no charge. |
| Electron | Outside the nucleus, negative charge. |
| Valence Electron | Electrons farthest away from the nucleus. |
| Proton | Inside the nucleus, positive charge. |
| Atomic Number | Number of protons in the nucleus. |
| Atomic Mass | All the protons and neutrons in the nucleus. |