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Unit 4
Term | Definition |
---|---|
Metal | ~Left of the stair-step line ~lose electrons in chemical reactions ~conductors of heat, electricity, shiny, malleable, and ductile |
Nonmetal | ~right of the stair-step line ~gains electrons in chemical reactions |
Metalloid | ~borders the stair-step line ~some properties of both metals & nonmetals |
Periodic law | ~repeating chemical and physical properties of element change |
Proton | ~positive ~1 amu ~nucleus ~discovered by Rutherford |
Neutron | ~subatomic particle ~no charge ~1 amu ~discovered by Chadwick |
Electron | ~outside the nucleus ~negative ~0 amu ~discovered by Thomson |
Atomic symbol | ~1st letter always capitalized ~other letters are lower cased ~identifies elements |