Question

The atomic number of vanadium $\left(V\right)$, chromium $\left(Cr\right)$, manganese $\left(Mn\right)$ and iron $\left(Fe\right)$ are respectively $23,24,25,26$. Which out these may be expected to have the jump in second ionisation enthalpy?

• A. $Mn$
• B. $Fe$
• C. $V$
• D. $Cr$

Answer 1

Answer: (D)

$Cr$

Cr has electronic configuration $\left[Ar\right]3d^{4}4s^2$ . After removal of an electron its electronic configuration will be $\left[Ar\right]3d^5$ as half filled configuration is very stable. Due to this stable configuration a jump is expected in second ionization energy of $Cr$.