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unit 3 lessons 1 + 2

matter and energy

atom the smallest particle into which an element can be divided into anything simplier
electrons these negatively charged particles
nucleus a small dense center that has a positive charge and is surrounded by moving electrons
protons the positively charged particles in nuclues
nuetrons uncharged particles
electron cloud electrons move within an area around the nucleus
atomic number number of protons in nucleus of atom
mass number number of protons and neutrons in nuclues
periodic table arrangement of elements
chemical symbol abbreviation for the elements name
average atomic mass an atom is weighted average of the masses of all the naturally occurring isotopes of that element
metal elements are shiny and conduct-heat and electricity well
nonmetal poor conductors of heat and electricity
metalliods both property of metals and non metals
group vertical column of eleents
period horizontal row of elements
Created by: 18khenry0114