| A | B |
|---|
| elements | Substances that are composed of only one type of atom. |
| compounds | Substnaces that are made up of more then one type of atom. |
| plutonium | transuranium element that is the most abundant |
| osmium | The densest element of all with atomic number of 76. |
| Periodic Table of the Elements | An arrangement of the elements by: Dimitri Mendeleev. |
| metals | These groups of elements are silver in color and conduct electricity. |
| nonmetals | Elements in liquid or gas form. |
| semimetals | Have the characteristics of both nonmetals and metals. |
| mercury | One of the fewest metals that is not a solid at room temperature. |
| chromium | Element used to keep steel from rusting. |
| H | the symbol for hydrogen |
| He | the symbol for helium |
| O | the symbol for oxygen |
| C | the symbol for carbon |
