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U3: Atoms

L1 & L2

TermDefinition
atom the smallest particle into which an element can be divided and still be the same element
electron negatively charged particles found within an atom
nucleus a small, dense center that has a positive charge and is surrounded by moving electrons
proton positively charged particles found within the nucleus
neutron particles that have no electric charge
electron cloud where there electrons reside around the nucleus
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 Maldeev's 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 occuring 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 vertical columns of the periodic table
period horizontal columns of the periodic table
Created by: 18Fontek0105