Which has a greater atomic size carbon or boron

Boron.

Explanation: The trend of atomic radius increases as we go from right to left on a periodic table, so since Boron is further left, Boron has a slightly larger radius.

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

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