| A | B |
|---|
| Nucleus | The tiny, central core of an atom |
| Proton | Positively charged particle in the nucleus of an atom |
| Electron | Negatively charged particle in an atom |
| Neutron | Uncharged particle in the nucleus of an atom |
| Atomic Number | Number of protons in the nucleus of an atom |
| Atomic Mass | Measurement of the mass of the particles in an atom |
| Valence Electron | The electrons furtherest from the nucleus |
| Group | The elements in a column of the periodic table |
| Period | Horizontal row across the periodic table |
| Ductile | Can be pulled into a long wire |
| Malleable | Can be pounded into shape |
| Metals | On the left side of the periodic table |
| Noble Gases | Group 18 elements |
| Nonmetals | On the right side of the periodic table |
| Metalloids | Along the zigzag line on the periodic table |
| Diatomic Molecule | Molecules that contain only 2 atoms |
| Semiconductor | Substances that carry electric charges under some conditions |
| Metalloids | Have some characteristics of metals and some of nonmetals |
| Conductors | Transmit heat and electricity easily |
| Alloy | Mixture of metals |
| Atom | The smallest particle of and element |
