How many electrons can the third electron shell (n=3) hold at maximum?

The third electron shell (n=3) can hold a maximum of 18 electrons, distributed across its various orbitals.

The breakdown of orbitals in the third shell is:

  • 1 s orbital (2 electrons)
  • 3 p orbitals (6 electrons)
  • 5 d orbitals (10 electrons)

So, the total capacity is 2+6+10=18 electrons.

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