MCQ
The value of $x$ in compound ' $D$ ' is $.........$.


- A$14$
- ✓$15$
- C$13$
- D$12$


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(Given: Atomic no. $Eu, 63; Sm , 62 ; Tm , 69 ; Tb$, $65 ; Yb , 70 ; Dy , 66]$
