d
a proton and neutron weigh about the same, while an electron is about 1/2000 of the weight of either a proton or neutron
Answer:
option (D)
Explanation:
The elementary particles of atom are protons, neutrons and electrons. The protons and neutrons are residing in the nucleus and electron revolves around the nucleus in fixed stationary orbits.
The mass of proton and a neutron is almost same and equal to 1.67 x 10^-27 Kg.
The mass of an electron is 9.1 x 10^-31 Kg.
The mass of electron is much less than the mass of proton or a neutron.
Proton is 1837 times heavier than the electron.
