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PS4
| Term | Definition |
|---|---|
| metals | left of the stair step line lose electrons in chemical reactions conductors of heat and electricity,shiny,malleable,and ductile |
| metalloid | border the stair step line some properties of both metals and nonmetals |
| nonmetal | right of the stair step line gain electrons in chemical reactions |
| periodic law | repeating chemical and physical properties of elements change |
| atomic symbol | identifies elements first letter capitalized other letters lower case |
| proton | positive nucleus mass of 1 amu discovered by rutherford |
| neutron | subatomic particle no charge located in nucleus mass of 1 amu discovered by chadwick |
| electron | subatomic particle negative located in electron cloud mass of 0amu discovered by thomson |