NEETChemistryClassification of Elements and Periodicity in Properties
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The first ionization enthalpy of 3 d series elements is more than that of group 2 metals Reason (R): In 3 d 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:
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- B(A) is true but (R) is false
- C(A) is false but (R) is true
- DBoth (A) and (R) are true but (R) is not the correct explanation of (A)
Correct answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
Metal Sc Ti V Cr Mn Fe Co Ni Cu Zn IE ( kJ / mol ) 631 656 650 653 717 762 758 736 745 906 Metal Be Mg Ca Sr Ba Ra IE ( kJ / mol ) 899 737 590 549 503 509 In the first transition series, the first and second ionization enthalpy values increase slowly on moving across the period. As the nuclear charge rises, the interaction between the nucleus and valence electrons increases, and as a result, the ionization enthalpy increases. So, Sc has the lowest value of ionization enthalpy while Zn has the highest value of ioniz