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General electron filling of elements of period 6 follows the order 1) ns + (n - 2)f (n-1)d →np2) ns np (n-1)d → (n-2)f3) ns (n-1)d (1-2)f →np4) ns → np → (n - 2)f → (n-1)d​

Answer» NIC ConfigurationExplanation:For period 6 elements the electronic configuration of some of the different elements are shown below, OS = [Xe] Ir = [Xe] By observing the TREND, we can infer that the electron filling will follow the trend ns + (n - 2)f (n-1)d →npAlso, there is an EASY way to memorise the electron filling order, follow the figure shown below,


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