Which type of chemical bond involves the sharing of valence electrons between two atoms?

Covalent bond is the type of bond which involves the sharing of valence electrons between two atoms. 
This bond usually arises from the equal attraction of the nuclei of the two atoms for the electrons shared.

Ionic bond, on the other hand, arises due to the transfer of electrons from the valence shell of one atom to the valence shell of the other.

13) a 14) a15) b16) i don't know sorry17) a (maybe)

Electrical charges of ionic bonds