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🧪 Chemistry  ·  Structure of Atom  ·  NEET & JEE

Which principle says the exact position and momentum of an electron cannot both be known exactly?

Answer: Heisenberg uncertainty principle.

  • A Aufbau principle
  • B Hund's rule
  • C Heisenberg uncertainty principle
  • D Pauli exclusion principle

Correct answer: C. Heisenberg uncertainty principle

Explanation: Heisenberg's uncertainty principle limits simultaneous exact measurement of position and momentum.

NK (n=1)L (n=2)M (n=3)

Bohr's model: electrons occupy fixed circular shells (K, L, M) around the nucleus, with each shell holding up to 2n2 electrons.

Concept context

Explore how electrons are arranged inside an atom. Covers Bohr's model, quantum numbers, Heisenberg's uncertainty principle, shapes of s, p, d orbitals, and electronic configuration rules.

Read the full Structure of Atom notes →