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Unit 3 Atoms

TermDefinition
atom the smallest particle into which an element can be divided and still be the same element
electron negatively charged particles
nucleus a small, dense center made up up smaller particles
proton positively charged particles
neutron uncharged particles
electron cloud a region around the nucleus of an atom where electrons are likely to be found
atomic number the number of protons in the nucleus of an atom
mass number the total number of protons and neutrons in an atom's nucleus
periodic table an arrangement of the elements in order by their atomic number
chemical symbol an abbreviation for an elements name
average atomic mass the weighted average of the masses of all naturally occuring isotopes of an element
metal elements that are shiny and conduct heat and electricity well
nonmetal poor conductors of heat and electricity and dull and brittle
metalloid elements that have some properties of both metals and nonmetals
group vertical column of elements
period horizontal column of elements
Created by: 18phillipsa0222
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