Metallic bonds are: A. bonds holding together atoms with very different
electronegativities.
B. bonds holding together a metal and a nonmetal.
C. bonds holding together two atoms of different kinds of metal.
D. bonds holding together two atoms of the same kind of metal.

D. bonds holding together two atoms of the same kind of metal.

Explanation:

Metallic bonds are very special kinds of interatomic forces that holds metals together and confers such unique properties on them.

The formation of this bond type is favored by large atomic radius, low ionization energy and a large number of electrons in the valence shell.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.