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The Periodic Table

Across
column of the periodic table which contains elements with similar properties
metal in group 1 of the periodic table that has one valence electron and is highly reactive
metal in groups 3 and 12 of the periodic table that is hard and shiny and less reactive than metals in groups 1 and 2
metal in group 2 of the periodic table that has two valence electrons and is very reactive but less so than an alkali metal
nonmetal in group 17 of the periodic table that has seven valence electrons and is highly reactive
class of elements that do not conduct electricity
Down
table of elements arranged by increasing atomic number or by increasing atomic mass
electron in the outer energy level of an atom that is potentially involved in chemical reactions
class of elements that have some properties of metals and some properties of nonmetals
class of elements that are good conductors of electricity
nonmetal in group 18 of the periodic table that has eight valence electrons (except helium) and is unreactive
row of the periodic table that contains elements ranging from metals on the left to metalloids and then nonmetals on the right