Question

what is the difference between an ionic compound and a molecular compound?
in ionic compounds the atoms (or group of atoms) exist as ions and are held together by covalent bonds. in molecular compounds the atoms are held together by electrostatic forces.
in ionic compounds the atoms (or group of atoms) exist as ions and are held together by electrostatic forces. in molecular compounds the atoms are held together by covalent bonds.

Explanation:

Ionic compounds consist of ions (formed by electron transfer) held by electrostatic forces (ionic bonds). Molecular compounds have atoms sharing electrons (covalent bonds). The second option correctly states these bonding types.

Answer:

Second option: In ionic compounds the atoms (or group of atoms) exist as ions and are held together by electrostatic forces. In molecular compounds the atoms are held together by covalent bonds.