Q23 of 44 Page 324

Explain why is there a phenomenal decrease in ionization enthalpy from carbon to silicon?

Ionization enthalpy of carbon (the first element of group 14) is very high (1086 kJ/mol). This is expected owing to its small size. However, on moving down the group to silicon, there is a sharp decrease in the enthalpy (786 kJ). This is because of an appreciable increase in the atomic sizes of elements on moving down the group.


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