What is the formal charge on the chlorine atom in the chlorate ion?

The modern periodic table has groups.

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

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.