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Solution


Q.

The number of element from the following that do not belong to lanthanoids is

Eu, Cm, Er, Tb, Yb and Lu                                   [2024]
1 5  
2 1  
3 3  
4 4  

Ans.

(2)

Lanthanoid series elements are 

La57(Lanthanum), 58Ce(Cerium), 59Pr(Praseodymium), 60Nd(Neodymium), 61Pm(Promethium), Sm62(Samarium), 

63Eu(Europium), 64Gd(Gadolinium), 65Tb(Terbium), 66Dy(Dysprosium), Ho67(Holmium), 68Er(Erbium), 

69Tm(Thulium), 70Yb(Ytterbium), and 71Lu(Lutetium).

Cm96(Curium) is an actinoid.