Moderate

A 4s orbital has:

Correct answer: D. Zero nodes

  • A. One node
  • B. Two nodes
  • C. Three nodes
  • D. Zero nodes

Explanation

A node is a region in an orbital where the probability of finding an electron is zero. In a 4s orbital, there are no nodes present. The electron density is maximum at the nucleus and gradually decreases as you move away from it, but there is no specific region where the probability of finding the electron becomes zero.

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Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.

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