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Unit 6 Vocabulary
1. Periodic law- states that the chemical and physical properties of elements are periodic functions
of their atomic numbers
2. Periodic- having a regular, repeating pattern
3. Period (2)
4. Group
5. Element
6. Atomic number
7. Alkali metals- group 1 on the periodic table, they are the most reactive metals and have only 1
electron in their outer shell
8. Alkaline earth-metals: group 2 of the periodic table, they are reactive metals, but less reactive
then Group 1 metals, and they have 2 electrons in their outer shell
9. Halogens- group 17 on the periodic table, they are very reactive nonmetals and they have seven
electrons in their outer shell
10. Noble gases- group 18 on the periodic table, they are unreactive and have 8 electrons in their
outer shell; except for Helium
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