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[?] metals are less dense than other metals

When alkali metals react with non metals they form [?] ions

When alkali metals react with water they form [?] and hydrogen

Group 1 melting points [?] from Lithium to Potassium

Metals found between Group 2 and Group 3

Transition metals have [?] melting points to Group 1

Group 7

Halogens react with metals to form [?] compounds

A more reactive halogen will [?] a less reactive halogen from a compound