A collision between reactant particles is most likely to result in a reaction when the particles hav

20. A collision between reactant particles is most likely to result in a reaction when the particles have proper orientation and proper (1) charge

(2) energy

(3) mass

(4) radius

Explanation: This one just needs to be memorized. In order for reactant molecules to collide effectively and product products, they need to have proper orientation and energy.

Answer: 2