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Unit 4

TermDefinition
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
Created by: Emily94278
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