When is a roman numeral most likely needed in the name of an ionic compound? A. When more than one polyatomic ion appears.
B. When the anion is a polyatomic ion.
C. When more than one cation is used in the formula.
D. When the cation is a transition metal.

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.

Why do electrons further from the nucleus have more energy

If 2 molecules of one reactant combine with 3 molecules of another to produce 5 molecules of a product, then what is the representation of the reaction?