Type the symbol The largest Alkali Metal ———
Halogen that is liquid at room temperature———
Most common element in earth———
Nonmetal with one valence electron———
A dense metal named for its use by Romans as pipes for plumbing———
Largest atomic radius of all period 4 element———-
Nonmetal that gain 3 electron to be stable like Neón———
Metalloid that that is a major component of sand———

Explanation:

Largest Alkali metal = Fr (Francium) Halogen that's liquid at room temperature = Br (Bromine) Most common element in earth = O₂ (Oxygen)Non-metal with 1 valance electron = Halogens (Group 17)A dense metal named for its use by Romans as pipes for plumbing = Pb (Lead) Largest atomic radius of all period 4 element = Kr (Krypton) Nonmetal that gain 3 electron to be stable like Neon = N₂ (Nitrogen) Metalloid that is a major component of sand = Si (Silicon)