Among the following transition elements, which one has the highest second ionisation energy? (.i.) V (Z = 23) (.ii.) Cr (Z = 24) (.iii.) Mn (Z = 25) (.iv.) Ti (Z = 22)

Question

Among the following transition elements, which one has the highest second ionisation energy? (.i.) V (Z = 23) (.ii.) Cr (Z = 24) (.iii.) Mn (Z = 25) (.iv.) Ti (Z = 22) (A) (i) (B) (ii) (C) (iii) (D) (iv)

Tardigrade Admin · Accepted Answer

The general trend observed in the second ionisation enthalpy of

3 d -

series elements is that as we move from left to right in the period, the ionisation energy increases. But,

C r

and

Z n

are exceptions to this trend. The value of second ionisation energy for

C r

is more than

M n

. This can be explained based on the electronic configuration of their

M^{+}

ions:

_24 C r_{+} = [A r] 3 d^{5}

and

_25 M n_{+} = [A r] 3 d^{5} 4 s^{1}

C r^{+}

has a stable electronic configuration because of half-filled

d -

subshell. Thus removing an electron from it is difficult. Therefore,

C r

has the highest second ionisation energy among the given elements.
The correct order for second ionisation energy for the given elements is

T i < V < M n < C r

.

Q. Among the following transition elements, which one has the highest second ionisation energy? (i)V(Z=23)(ii)Cr(Z=24)(iii)Mn(Z=25)(iv)Ti(Z=22)

(i)

(ii)

(iii)

(iv)

Q. Among the following transition elements, which one has the highest second ionisation energy?
$(i) V (Z = 23) (ii) C r (Z = 24) (iii) M n (Z = 25) (i v) T i (Z = 22)$