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    size of the d orbital gap

    What size of the d orbital gap means in Chemistry A-Level, as defined for AQA.

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    The energy difference between the ground state and the excited state of the d electrons, calculated using h = 6.63 × 10⁻³⁴ J s and c = 3.00 × 10⁸ m s⁻¹.
    AQA · Formation of coloured ions (A-level only) (study guide)

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