NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- Classification of Elements and Periodicity in Properties
NTA Abhyas 2020 · Chemistry · Classification of Elements and Periodicity in Properties
The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn)...
The atomic numbers of vanadium chromium \left(\text{Cr}\right)\text{,} and iron are respectively and Which one of these may be expected to have the highest second ionization enthalpy?
Options
- A
- B
- C
- D
Correct answer
C.
Step-by-step solution
Consider Electronic configuration of
{}_{\text{23}} V^{+} {⇒}_{\text{18}} \text{[Ar]}{\text{4s}^{1} {\text{3d}^{3}
{}_{\text{24}} {\text{Cr}^{+} {⇒}_{\text{18}} \text{[Ar]}{\text{4s}^{0} {\text{3d}^{5}
{}_{\text{25}} {\text{Mn}^{+} {⇒}_{\text{18}} \text{[Ar]}{\text{4s}^{1} {\text{3d}^{5}
{}_{\text{26}} {\text{Fe}^{+} {⇒}_{\text{18}} \text{[Ar]}{\text{3d}^{6} {\text{4s}^{1}
Removal of second electron from stable configuration of {}_{\text{18}} \text{[Ar]}{\text{4s}^{0} {\text{3d}^{5} will require very high energy input i.e. as it will disturb the stable electronic configuration of {\text{3d}^{5} (half filled subshell).
{}_{\text{23}} V^{+} {⇒}_{\text{18}} \text{[Ar]}{\text{4s}^{1} {\text{3d}^{3}
{}_{\text{24}} {\text{Cr}^{+} {⇒}_{\text{18}} \text{[Ar]}{\text{4s}^{0} {\text{3d}^{5}
{}_{\text{25}} {\text{Mn}^{+} {⇒}_{\text{18}} \text{[Ar]}{\text{4s}^{1} {\text{3d}^{5}
{}_{\text{26}} {\text{Fe}^{+} {⇒}_{\text{18}} \text{[Ar]}{\text{3d}^{6} {\text{4s}^{1}
Removal of second electron from stable configuration of {}_{\text{18}} \text{[Ar]}{\text{4s}^{0} {\text{3d}^{5} will require very high energy input i.e. as it will disturb the stable electronic configuration of {\text{3d}^{5} (half filled subshell).