Question

value: 3
when two atoms, with incomplete valence shells, share electrons, they form a(n) ___ bond.

a. covalent

b. ionic

c. metallic

d. hydrogen

Explanation:

To solve this, we analyze each option:

• Option a: Covalent bonds are formed when atoms share electrons to complete their valence shells. This matches the description.
• Option b: Ionic bonds involve the transfer of electrons (not sharing), so this is incorrect.
• Option c: Metallic bonds are about a "sea" of delocalized electrons in metals, not sharing between two atoms with incomplete shells in the described way.
• Option d: Hydrogen bonds are weak attractions (not electron - sharing bonds between two atoms to complete valence shells).

Answer:

a. covalent