For each missing word or phrase, circle the choice that correctly completes the
sentence.
when electrons transfer from one atom to another, both atoms become (ions /
isotopes / molecules / electrons) and they are held together by a(n) (polar /
covalent / molecular / ionic) bond. when electrons are shared between atoms,
a(n) (ionic / covalent / hydrogen / point) bond forms between the atoms, and
the joined atoms become a(n) (element / ionic compound / molecule /
isotope)