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...Periodic table vocabulary a chart that organizes information about all of the known elements according to their atomic number element substance cannot be broken down into simpler by ordinary chemical means atom smallest unit an has properties basic building block matter mass protons and neutrons in nucleus one located under elemental symbol at bottom box on contained each its atoms over top period horizontal row left right group vertical column up reactivity describes how likely is form bonds with other valence electrons are outermost energy level ion gained or lost more metal conducts heat electricity malleable ductile low ionization electronegativity values metals tend lose cations found side boron staircase nonmetal does not conduct usually gas room temperature nonmetals brittle have high energies gain anions metalloid some metalloids there b si ge as sb te po inert compounds when put together unable react chemically noble gases because full shell alkali contain electron most easily...