Question

Which atom is most likely to form a metallic bond?

aluminum (Al)
helium (He)
phosphorus (P)

Answer 1

Aluminum (Al).

Reason: metallic bonding involves a lattice of positive ions sharing a "sea" of delocalized valence electrons. Al is a metal with delocalizable valence electrons, whereas He is an inert noble gas and P is a nonmetal that forms covalent bonds.