Explain why second ionisation enthalpy of K is more than that of Ca?
(ii) Explain why electron gain enthalpy of Cl is more than that of F?
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Ca+ has more shells and shielding than K+ . This outweighs the fact that Ca+ has more protons in the nucleus, meaning means there is a weaker attraction between the nucleus and the electron to be removed, meaning less energy is required to remove it.
ii) It is due to small size of fluorine atom. As, there are strong inter electron repulsion in the relatively small 2P orbits of fluorine and thus, the incoming electron does not experience much attraction. Therefore chlorine has the electron gain enthalpy than the fluorine.
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