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Option 3 : MN = MP

Mass of Proton is equal to the Mass of Neutron.

Particle

 

Charge/C

 

Mass/Kg

 

Protons

 

1.6 × 10-19 C

 

1.6726 x 10-27 Kg

 

Neutrons

 

0

 

1.6749 x 10-27 Kg

Electrons

 

1.6 x 10-19 C

 

9.11 x 10-31 Kg

 

 

Mistake Points

  •  Neutrons weigh slightly higher than protons.
  • The number of neutrons, together with the number of protons, form the atomic mass number. ​
  • The neutron is very slightly heavier than the proton, by about 0.1%, or 1.00137841887 according to the best measurements. Which is negligible in nature so the mass of a proton is equal to the neutron
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