The subatomic particles that play the key role in determine the properties of an element electrons

Iknow the answer is a but i don't know why

Ihat will happen if i added baking soda to vinegar

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.