1.

Total number of d electrons present in an element with atomic number 78 is :-

Answer»

8
58
29
38

Solution :Atomic NUMBER 78
`Sc"" - ""_(30)Zn "" 3d e^(-)"" -"" 10`
`Y ""- ""_(48)CD"" 4d e^(-) ""- ""10`
`La"" - ""_(80)Hg "" 5D e^(-)"" - ""10`


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