Question

how do ionic bonds differ from covalent bonds?
electrons are shared in a covalent bond.
protons are shared in a covalent bond.
protons are transferred in a covalent bond.
electrons are transferred in a covalent bond.

Explanation:

In ionic bonds, electrons are transferred (one atom donates electrons to another). In covalent bonds, atoms share electrons. Protons are in the nucleus and not involved in bonding in this context. So the key difference is that electrons are shared in a covalent bond.

Answer:

Electrons are shared in a covalent bond.