Question

Among the element n, o, f, and cl . Which has highest 1st ionisation enthalpy

Answer 1

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here is your answer

The more electronegative elements like the halogens (F,Cl,Br,I) have high values of 1st I.E.. This is because the last group elements have more effective nuclear cahrge and are more tightly bound to the nucleus. Hence, electrons need high energy to escape the atom.

generally , noble gases are highest in ionisation enthalpy.

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