What type of bond is HH

nonpolar covalent bond

Explanation:

To determine the level of the polarity of the bond, we can make use of the electronegativity values.

EN H = 2.2

By taking the electronegativity difference between the two elements on the bond, we can gauge whether the bond is ionic, polar covalent, or nonpolar covalent.

EN difference = 2.2 - 2.2 = 0

It's safe to say that the H-H bond is nonpolar covalent.

Covalent bond are affected by the electronegativity of the connected atoms. Two atoms with equal electronegativity will make non-polar covalent bonds such as H-H.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."