Comment on the following observations: (a) The density of HfO 2 (9.68 g cm 3 ) is
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Comment on the following observations:
(a) The density of HfO2 (9.68 g cm−3) is much greater than that of ZrO2 (5.73 g cm−3).
(b) NbF4 is paramagnetic but NbCl4 and NbBr4 are essentially diamagnetic.
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