The Hund's Rule will be violated if presence of two electrons in one 2p orbital, but none in the other 2p orbitals occur.
The presence of two electrons in one 2p orbital, but none in the other 2p orbitals violates the Hund's Rule. There must be one electron with the same spin in each orbital of the same energy before you can put two in the same orbital. The electrons in the half-filled 4d orbitals don't all have the same spin.
According to Pauli's Exclusion Principle, no more than two electrons can occupy the same orbital and two electrons in the same orbital must have opposite spins so we can conclude that the Hund's Rule will be violated if presence of two electrons in one 2p orbital, but none in the other 2p orbitals occur.
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