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Q.

Which of the following statements about the electron is incorrect?

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a

It is a negatively charged particle

b

The mass of electrons is equal to the mass of a neutron

c

Electrons revolve around the nucleus in discrete orbits

d

Electrons have a mass of approximately 9.11 x 10-31 kg

answer is B.

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Detailed Solution

  • An electron is a negatively charged particle.
  • The negative charge is equal to 1.602 × 10-19 coulomb in magnitude.
  • Electrons revolve around the  nucleus in discrete orbits
  • Electrons are much lighter than protons and neutrons and have a mass of approximately 9.11 x 10-31 kg.
  • So the statement 'The mass of electrons is equal to the mass of neutron' is incorrect.
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