Does the atomic nucleus contain protons, neutrons and electrons

In an oxidation-reduction reaction, oxidation is what happens when a reactant

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

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.