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Unit 3
Atoms and the Periodic Table
| Term | Definition |
|---|---|
| atom | the smallest particle into which an element can be divided and still be the same element |
| electron | negatively charged particles |
| nucleus | a small, dense center that has a positive charge and is surrounded be moving electrons |
| proton | positively charged particles in the nusleus |
| nuetron | uncharged particles in the nucleus |
| electron cloud | the area around the nucleus in which the particles move |
| atomic number | the number of protons in the nucleus of an atom |
| mass number | the total number of protons and neutrons in an atoms nucleus |
| periodic table | Dmitri Mendeleev's arrangement of the elements |
| chemical symbol | an abbreviation for the elements name |
| average atomic mass | the weighted average of the masses of all the naturally occurring isotopes of that element |
| metal | elements that are shiny and conduct heat and electricity well |
| nonmetal | poor conductors of heat and electricity |
| metalloid | elements that have some properties of metals and some properties of nonmetals |
| group | each vertical column on the periodic table |
| period | each horizontal row of elements of the periodic table |
Created by:
18boller0315
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