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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 |