Question

what is the nature of a bond between hydrogen and hydrogen? nonpolar covalent metallic polar covalent ionic

Explanation:

• Nonpolar Covalent: In a hydrogen - hydrogen bond ($H - H$), the two hydrogen atoms have the same electronegativity. They share the electron pair equally.
• Metallic: Metallic bonds occur between metal atoms. Hydrogen is a non - metal, so this option is incorrect.
• Polar Covalent: Polar covalent bonds form when there is a significant electronegativity difference between the bonded atoms. Since both atoms are hydrogen (same electronegativity), this is not the case.
• Ionic: Ionic bonds form between a metal and a non - metal (or a cation and an anion). Hydrogen is a non - metal, and there is no transfer of electrons (as in ionic bonds) in $H - H$ bond.

Answer:

Nonpolar Covalent