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16 terms
Terms | Definitions |
|---|---|
 Dmitri Mendeleeve | Russian chemist who discovered the periodic law and created a periodic table of elements based upon that law. He organized the elements in order of increasing mass. |
| Periodic Table | An arrangement of elements in columns, based on a set properties that repeat from row to row (127) |
| Period | A row in a periodic table of elements (131) |
| Group | A column of elements in a periodic table (131) |
| Periodic Law | The pattern of repeating properties displayed by elements in the periodic table (131) |
| Atomic Mass Unit | One twelfth the mass of a carbon-12 atom (134) |
| Atomic Mass | A number based upon the distribution of an element isotopes in nature and the masses of those isotopes. (134) |
| Metals | Elements that are good conductors of heat and electric current (135) |
| Transition Metals | Elements that form a bridge between elements on the left and right sides of the periodic table (136) |
| Nonmetals | Elements that are poor conductors of heat and electric current (136) |
| Metalloids | Elements with properties that fall between those of metals and nonmetals (136) |
| Valence Electron | An electron that is in the highest occupied energy level (139) |
| Alkali Metals | The elements in Group 1A of the Periodic Table, not including hydrogen (140) |
| Alkaline Earth Metals | The elements in Group 2A of the Periodic Table (141) |
| Halogens | The elements in Group 7A of the Periodic Table (144) |
| Noble Gases | The elements in Group 8A of the Periodic Table (145) |
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