| A | B |
|---|
| atomic theory | the theory that all is made up of tiny particles called atoms |
| nucleus | the very tiny center of an atom |
| proton | a subatomic particle with a positive charge |
| neutron | a subatomic particle with no charge |
| electron | a subatomic particle with a negative charge |
| protons, neutrons, electrons | the subatomic particles that make up an atom |
| element | a substance that is made up of only one kind of atom |
| atom | the smallest unit of an element that has all of the properties of that element |
| molecule | 2 or more atoms linked together |
| how elements are arranged on the periodic table | by atomic number |
| atomic numbers and properties of the elements | the 2 things that determine the arrangement of elements on the periodic table |
| compound | a substance made of the atoms of 2 or more elements |
| luster | not found on the periodic table |
| Kr | Krypton |
| Rb | Rubidium |
| Sr | Strontium |
| Y | Yttrium |
| Zr | Zirconium |
