4. Chlorine exists in two forms - chlorine-35 and
chlorine-37. The atomic number of chlorine is 17.
(a) What name is given to different forms of the
same element?
(b) Write down the number of protons and
neutrons in each type of chlorine atom.

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.