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Question

What is the lowest energy orbital?


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Solution

Lowest energy orbital:

  • The lowest energy orbital is that which is closest to the nucleus of an atom.
  • 1s orbital is closest to the nucleus and hence has the lowest energy orbitals.

From (n+l) rule: The lower will be the value of (n+l), the lower will be the energy of orbital.

For 1s orbital:

n=1, s=0

So, (n+l) = 1+0 = 1, which is possible minium value of (n+l).

  • 1s the orbital is spherically symmetric and can possess a maximum of two electrons in its subshell.

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