SOMEONE HELP PLEASE NEED COEFFICENTS

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Why is retrograde motion an apparent motion

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.