3 exception ko chhodkr k baaki all Lanthonoid ka configuration (Xn) 6s2 F (0_14) hota hai according to their increasing atomic no 3 exception 👉 Ce,Gd and Lu inn 3 me phle 1 electron d me jayega than f me It's very simple
You're wrong. 4f mai 2 electrons nhi aa skte Bcoz La ki configuration mai 4f mai 0 electron hai toh ce comes after La toh ce ke 4f mai direct 2 electrons enter hona impossible hai Hope you understand