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unit 3 matter/energy

unit 3 lesson 1&2

atom smallest particle into which an element can be divided and still be the same element
electrons negative charged particles
nucleus small dense center positive charge surronded by moving electrons
proton positively charged
neutron have no electric charge
electron cloud negative particles moving around nucleus
atomic number number of protons in the nucleus of an atom
mass number total number of protons and neutrons in atoms nucleus
periodic table arrangement of elements
chemical symbol abbreviation for an elements name
average atomic mass atom is the weighed average of masses of all the naturally occuring isotopes of that element
metals elements that are shiny and conduct heat and electricity
nonmetals poor conductors of heat and energy
metalloids some properties of metals and nonmetals
group vertical line in the periodic table
period horizontal row of elements on periodic table
Created by: 18ddunn0914