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B4 U3 L1+2
| Term | Definition |
|---|---|
| atom | the smallest particle into which an element can be divided and still be the same element |
| electron | negatively charged particles within an atom |
| nucleus | the small, dense center of an atom that is positively charged that is surrounded by electrons |
| proton | the positively charged particles in the nucleus |
| nuetron | uncharged particles in the nucleus |
| electron cloud | the area that electrons move around the nucleus |
| atomic number | the number of protons in the nucleus of an atom |
| mass number | the total number of neutrons and protons in the nucleus of an atom |
| periodic table | Mendeleev's arrangement of elements |
| chemical symbol | abbreviation of element's name |
| avg. atomic mass | the weighed avg of the masses of all isotopes of that element |
| metal | conduct heat and electricity and are shiny |
| nonmetal | dull, poor conductors of heat and electricity |
| metalloid | some metal and some nonmetal properties |
| group | vertical column of elements on periodic table |
| period | row of elements on periodic table |