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the atom u3, l1&l2
| Term | Definition |
|---|---|
| atom | is 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 by moving electrons. |
| proton | positively charged particles in the nucles |
| neutron | nucleus contains uncharged particles |
| electron cloud | electrons move within an area around the nucleus. |
| atomic cloud | number of protons in the nucleus of an atom |
| mass number | the total number of protons and neutrons in an atom's nucleus. |
| periodic table | Mendeleev's arrangement of the elements |
| chemical symbol | is an abbreviation for the element's name. |
| average atomic mass | an atom is the weighted average of the mass of all the naturally occurring isotopes of that element. |
| metal | are elements that are shiny and conduct heat and electricity well. |
| nonmetal | are poor conductors of heat and electricity. |
| metalliod | are elements that have some properties of metals and some properties of nonmetals. |
| group | each vertical column of elements(from top to bottom) on the periodic table. |
| period | each horizontal row of elements(from left to right) on the periodic table. |
Created by:
18tgal0513
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