Question

4. Which hypothesis led to the discovery of the proton?

A.Cathode rays should be attracted to a positively-charged plate.
B.The nucleus of an atom should contain neutrons.
C.When a neutral hydrogen atom loses an electron, a positively-charged
particle should remain.
D.A proton should be 1840 times heavier than an electron.​

Answer 1

Option C.When a neutral hydrogen atom loses an electron, a positively-charged .

Explanation:

• When a neutral hydrogen atom loses an electron a positively charged particle must remain.
• Proton is a positive charge of +1 e charge with a mass that is slightly less than that of a neutron.
• Ernest Rutherford discovered that a atom must have a concentrated positive charge at the center that contains most of the atom's mass. He stated that the nucleus contained a positive charge the proton. And the weight of a proton is 1837 times heavier than the weight of the electron.

Result: Losing of an electron by hydrogen lefts a positive charge i.e proton.