Which of the following is the minimum energy required for a reaction to occur?
A
activation energy

B
orientation energy

C
ionization energy

D
collision energy

Option A activation energy is correct

Explanation:

The minimum amount of energy needed for a reaction to proceed is the least amount of kinetic energy which molecules must have to cause an “effective collision” (i.e. a collision which can break pre-existing bonds), this is also known as the Activation Energy of a chemical reaction

Ionization energy = the energy required to remove an electron from a gaseous atom or ion

Collision energy =  an instrument parameter that is frequently optimized to increase fragment ion intensity.

Option A activation energy is correct

the answer is c.the valence of the atoms combine .