| A | B |
|---|
| Atom | The smallest particle of matter. |
| Element | A substance that cannot be broken down into other substances. |
| Atomic Mass Unit (AMU) | The total number of protons and neutrons in the nucleus of an atom. |
| Atomic Number | The number of protons in an atom. |
| The Periodic Table | The table used to organize the elements based on the elements by their properties. |
| Families | Groups of atoms that have similar properties. |
| Periods | Horizontal rows of elements. The properties of these elements gradually change across the row. |
| Valence Electrons | Electrons involved in chemical bonding. |
| Alloy | A mixture of metal elements created to use the best properties of the combined metals. |
| Dmitri Mendeleev | Recognized the patterns of element properties and suggested a way to organize them. |
| States of Matter | Solid, Liquids, Gases |
| Metal Elements | Elements that are hard, shiny, malleable, ductile and are good conductors of heat and electricity. |
| Non-Metal | Elements that lack most are dull, brittle and poor conductors of heat and electricity. |
| Metalloid | An element that has some properties of Metals and some properties of Non-metals. |
| zig-zag line | The line on the Periodic Table that separates metal elements from non metal elements. |
