which statement accurately describes the charge of the nucleus of an atom? - the nucleus can be either positively charged or neutral. - the nucleus never has an electrical charge. - the nucleus always has a positive charge. - the charge of a nucleus can change from a positive to a negative.

The characteristics 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 an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.