Which of the following statements is not correct?
a. covalent compounds are held together by much stronger interparticle forces than are ionic compounds.
b. ionic bonds and covalent bonds are the result of atoms trying to achieve full outermost energy levels.
c. more than two electrons can be transferred in ionic bonds or shared in covalent bonds.
d. covalent compounds result from sharing of electrons, and ionic compounds result from the electron transfer from one atom to another.