Please help I’m stuck

What are the concentrations of hydroxide and hydronium ions in a solution with a ph of 10.2?

Rutherford's experiment indicated that matter was not as uniform as it appears what part of his experimental results implied this idea

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.