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Unit 3 <1&2


atom the smallest particle into which an element can be divided and still be the same element
electron negatively charged particles
nucleus small, dense center that has a positive charge surrounded by moving electrons
proton positively charged particles
neutron uncharged particles
electron cloud the area that electrons move around the nucleus
atomic number number of protons in the nucleus of an atom
mass number total number of protons and neutrons in an atom's nucleus
periodic table arrangement of the elements
chemical symbol an abbreviation for the element's name
average atomic mass the weighted average of the masses of all the naturally occurring isotopes of that element
metal elements that are shiny and conduct heat and electricity well
nonmetal poor conductors of heat and electricity; often dull and brittle
metalloid elements that have some properties of metals and some properties of nonmetals
group each vertical column of elements from top to bottom on the periodic table
period each horizontal row of elements from left to right on the periodic table
Created by: 18mturnbough1220