MCQ
Variable valency in general, is exhibited by
- ✓Transition elements
- BGaseous elements
- CNon-metals
- D$s$-block elements
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Assertion $(A)$ : The first ionization enthalpy of $3 d$ series elements is more than that of group $2$ metals
Reason $(R)$ : In $3d$ series of elements successive filling of d-orbitals takes place.
In the light of the above statements, choose the correct answer from the options given below :