Answer:
It's simple substitution reaction and there is no balance for the equation. It's right written.
Explanation:
Answer:
C: The atomic nucleus contains most of the mass.
Number of neutrons is 121.
Effective collisions are those that result in a chemical reaction. In order to produce an effective collision, reactant particles must possess some minimum amount of energy. This energy, used to initiate the reaction, is called the activation energy.
