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:

Question

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:

Aicharya · Accepted Answer

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 ionization enthalpy. So, both assertion and reasons are true and reason is the correct expalantion of assertion.

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 $(kJ / mol)$	$899$	$737$	$590$	$549$	$503$	$509$

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).…

Solution