The energy stored within the nucleus of an atom; energy released from a fission or fusion reaction is called

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).