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Unit 3, Lesson 1, 2
| Question | Answer |
|---|---|
| Atom | The smallest particle into which an element can be divided and still be the same element. |
| Electron | Negatively charged particles |
| Nucleus | A small, dense center that has a positive charge and is surrounded by moving electrons |
| Proton | Positively charged particles |
| Neutron | Uncharged particles |
| Electron Cloud | Area around the nucleus |
| Atomic Number | The number of protons in the nucleus of an atom |
| Mass Number | The total number of protons and neutrons in an atom's nucleus |
| Periodic Table | Arrangement of elements |
| Chemical Symbol | Abbreviation for an element's name |
| Average Atomic Mass | Weighted average of the masses |
| Metal | Elements that are shiny |
| Nonmetal | Poor conductors of heat and electricity |
| Metalloid | Elements that have some properties of metals and nonmetals |
| Group | Column of elements |
| Period | Horizontal row of elements7 |