Question

The second ionization enthalpy of Ca is higher than first and yet calcium forms $CaCl_{2}$ and not CaCl, why?

Answer 1

Ionization energy is the amount of energy required to removal of an electron from isolated gaseous atom .

Calcium atomic number 20. Electronic configuration is ${ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }^{ 6 }{ 3s }^{ 2 }{ 3p }^{ 6 }.$

The calcium element forms only $Ca{ Cl }_{ 2 }$ but form CaCl because when ${ Ca }^{ 2+ }$ combines with $2C{ l }^{ - }$ ions, the lattice energy to compensate the second and first ionization energy of Ca.

Moreover $C{ a }^{ 2+ }$ is having noble gas configuration. Therefore, it is more stable.

Answer 2

Answer:The calcium element forms only but form CaCl because when combines with ions, the lattice energy to compensate the second and first ionization energy of Ca. Moreover is having noble gas configuration. Therefore, it is more stable

Explanation: