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unit 3 l1 and 2
| Term | Definition |
|---|---|
| atom | is the smallest particle into which an element can be divided and still be the same element |
| nucleus | a small, dense center that has a positive charge and is surrounded by moving electrons |
| protons | the positively charged particles in the nucleus |
| electrons | the particles in the atoms that are negatively charged |
| neutrons | uncharged particles that the nucleus contains |
| electron cloud | electrons that move within an area around the nucleus |
| atomic number | the number of protons in the nucleus of anatom |
| mass number | the total number of protons and neutrons in an atoms nucleus |
| periodic table | arrangement of the elements |
| chemical symbol | is an abbreviation for the elements name |
| average atomic mass | of an atom is the weighted average of the masses of all the naturally occurring isotopes of that element |
| metals | are elements that are shiny and conduct heat heat and electricity |
| nonmetals | are poor conductors of heat and electricity |
| metalloids | are elements that have some properties of metals and some properties |
| group | verticle column in the periodic table |
| period | horizontal row of elements on the periodic table |
Created by:
18potterd0315
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