Which quantum number decides the energy of orbitals?
Correct answer: B. Principal Quantum Number (n)
- A. Magnetic Quantum Number (m)
- B. Principal Quantum Number (n)
- C. Azimuthal Quantum Number (l)
- D. All of these
Explanation
The principal quantum number (n) determines the energy level of an electron. Higher values of n indicate higher energy levels. For example, n=1 represents the lowest energy level, n=2 the next, and so on.
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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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