A covalent chemical bond is one in which:_____.a) outer-shell electrons of one atom are transferred to the inner electron shells of another atom.b) protons or neutrons are shared by two atoms so as to satisfy the requirements of both.c) the inner-shell electrons of one atom are transferred to the outer shell of another atom.d) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged.e) outer-shell electrons are shared by two atoms so as to satisfactorily fill the outer electron shells of both.f) an electron occupies a hybrid orbital located between the nuclei of two atoms.