Question

which element is least likely to form chemical bonds?
phosphorus (p)
helium (he)
sodium (na)
carbon (c)

Explanation:

Helium (He) is a noble gas. Noble gases have a full valence electron shell, which makes them very stable and less likely to gain, lose, or share electrons to form chemical bonds. Phosphorus (P) has 5 valence electrons and can form bonds to achieve a more stable electron configuration. Sodium (Na) has 1 valence electron and readily loses it to form a positive ion and bond. Carbon (C) has 4 valence electrons and can form multiple bonds (covalent) to complete its octet.

Answer:

helium (He)