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The discovery of neutron became very late because

  • A.It is present in nucleus
  • B.It is a fundamental particle
  • C.It does not move
  • D.It does not carry any charge

Answer: D

The neutron was discovered late because it carries no charge.

The detectors of the day - cloud chambers, electroscopes, ionisation counters - all responded to ionisation caused by charged particles. A neutral particle leaves no track. Chadwick identified it only in 1932, by measuring the recoil of protons knocked out of paraffin.

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