Why does the mass number only include the number of protons and the neutrons (not electrons)?

Which answer lists the fundamental forces in order from strongest to weakest

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

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.