Question

Third ionization enthalpy of $Ca$ is much more greater than that of its second ionisation enthalpy because:

• A. $C{a}^{2+}$ ion has complete octet.
• B. $C{a}^{+}$ ion has complete octet.
• C. $Ca$ has complete octet.
• D. it is difficult to remove an electron from full filled orbit.

Answer 1

Answer: (A), (D)

$C{a}^{2+}$ ion has complete octet.
it is difficult to remove an electron from full filled orbit.

Electronic configuration of $Ca$ is $1s^{2}2s^2{2p}^{6}3s^{2}3p^{6}4s^2$.

${Ca}^{+2}$ has complete octate $1s^{2}2s^2{2p}^{6}3s^{2}3p^6$ which is electronic configuration of $\left[Ar\right]$

Hence, it is difficult to remove an electron from fully filled orbit which is why third ionization enthalpy of

CaCa is much more greater than that of its second ionisation enthalpy .