Where is boron’s and carbon’s fifth electron located

Explanation:

The electrons fill the orbitals of the atom in increasing order of energy level. Using Aufbau's mnemonic rule you can find the order of filling:

Thus, the firs two electrons are located on the 1s orbital, the next two electrons are on the 2s orbital, and the the fifth, electron of both boron and carbon is located on a 2p orbital.

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