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  4. How many of the following elements belong to 5d series? Hf,Cd,Cu,Hg,Y,Ag,Pt,Ac

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Q. How many of the following elements belong to $5d$ series?
$Hf,Cd,Cu,Hg,Y,Ag,Pt,Ac$

NTA AbhyasNTA Abhyas 2022

Solution:

5d–series consists of elements La (atomic number 57) and from Hf (atomic number 72) to Hg (atomic number 80). These elements lie in the 6th period. The elements of this series involve the gradual filling of 5d orbitals.
$Hf,Hg$ and $Pt$ belong to $5d$ series.