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प्रश्न
Explain the following:
Gallium has higher ionisation enthalpy than aluminium.
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उत्तर
Due to ineffective shielding of valence electrons by the intervening 3d electrons, the effective nuclear charge on Ga is slightly higher than that on A1 and hence the ∆Hi of gallium is slightly higher than that of Al. Boron has three electrons in the valence shell. Because of its small size and high sum of the first three ionisation enthalpies.
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संबंधित प्रश्न
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