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Atoms/Periodic Table

Unit 3

TermDefinition
Atom The smallest particle into which an element can be divided and still be the same element
Electron Negatively charged particles in an atom
Nucleus A small, dense center that has a positive charge and is surrounded by electrons
Proton Positively charged particles in the nucleus
Neutron Uncharged particles in an atom
Electron Cloud An area around the nucleus that electrons move in
Atomic Number The number of protons in the nucleus of an atom
Mass Number The total number of protons and neutrons in an atom
Periodic Table Mendeleev's arrangement of the elements
Chemical Symbol An abbreviation of an elements name
Average Atomic Mass The weighted average of the masses of all naturally occurring isotopes of that element
Metal Elements that are shiny and conduct heat and electricity well
Nonmetal Poor conductors of heat and electricity
Metalloid Elements that have some properties of metals and nonmetals
Group A vertical column of elements on the periodic table
Period A horizontal row of elements on the periodic table
Created by: 18bucholtzc0919
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