| A | B |
|---|
| Chemical Symbol | A symbol for the name of an element. |
| Nucleus | The positively charged center of an atom. |
| Electrons | Negatively charged particles moving around the nucleus. |
| Protons | Found in the nucleus, positive charge. |
| Neutrons | Found in the nucleus, no charge. |
| Atomic Number | The number of protons in the nucleus. |
| Electron cloud | A region where the electrons move about. |
| Quarks | Make up protons and neutrons. |
| Mass Number | The sum of the protons and neutrons. |
| Isotopes | Atoms of the same element that have different numbers of neutrons. |
| Periodic table | The orderly arrangement of elements. |
| Groups | The vertical columns of the periodic table. |
| Dot diagram | Represents the electrons in the outer energy level. |
| Periods | Horizontal rows of the periodic table. |
| Metals | Shiny and good conductors of heat and electricity. |
| Nonmetals | Most are gases, and do not conduct heat and electricity well. |
| Metalloids | Have properties of both metals and nonmetals. |
