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An ionisation energy

Why is the first ionisation energy of chlorine is higher than that of sulphur ?

i need help with this questions taken from a textbook which has no answers at the back. so i have no way of checking if i dne it rite.

any help is appreichated

thanks

Reply 1

niketpatel71

sorry/ As you go across the period the ioinisation energy increases because their is an increase in the atomic number thus the nuclear charge increases and there is no corresponding increasing in the shielding effect. so the outter electrons are held more tightly and more energy is required to remove them.