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The mass of the electrons is negligible when compared to protons. 


Options:
A .   True
B .   False
C .   Bohr's
D .   Dalton's
Answer: Option A
:
A
Atoms have electrons, protons, and neutrons as the fundamental particles.
Subatomic particleMass (kg)Proton1.67262178 × 1027Neutron 1.6749 × 1027Electron 9.10938291 × 1031
Mass of protonMass of electron1.67262178×10279.10938291×1031 = 1840
Thus, mass of electron is 11840, i.e., 0.0005 times that of proton.
Hence, the mass of an electron is negligible when compared to the mass of proton.

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