How do 'd' block elements have last 2 shells are incompletely filled?
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Please find below the solution to the asked query:
The elements which lie in between s block and p block are called transition elements. They are from group 3 to 12 in the modern periodic table. They have 2 incomplete shell, because the electrons are arranged according to Aufbau principle. i.e., with the increasing energy level electrons are filled up. After filling the 4s​ 2 electrons they enter into 3d orbital where 10 electrons are filled up. After filling up 3d10 electrons they enter into the 4p level likewise it can go up.
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Please find below the solution to the asked query:
The elements which lie in between s block and p block are called transition elements. They are from group 3 to 12 in the modern periodic table. They have 2 incomplete shell, because the electrons are arranged according to Aufbau principle. i.e., with the increasing energy level electrons are filled up. After filling the 4s​ 2 electrons they enter into 3d orbital where 10 electrons are filled up. After filling up 3d10 electrons they enter into the 4p level likewise it can go up.
Hope this information will clear your doubts regarding the topic.
If you have any other doubts please ask here on the forum and our experts will try to solve them as soon as possible.
Regards​