An ionic compound is formed when

a a metal bonds with another metal
b a nonmetal bonds with another nonmetal
c a metal bonds with a nonmetal
d three nonmetals bond together

The electron configuration for chromium is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 5 4 s 1 instead of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 4 4 s 1 . the configuration is an exception to the

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

The biosphere of the earth is made up of what compound? organic or inorganic?