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Alkali metals have the lowest  ionisation enthalpy in each period. Why?

Dear student ,

Kindly refer to the similar link :

https://www.meritnation.com/ask-answer/question/alkali-metals-show-photoelectric-effect-why/classification-of-elements-and-periodicity-in-properties/11492223

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Because they have bigger size so the positive and negative charged particles are comparitively far. So the attraction between the nucleus and electron is less. Thats why it require less energy to ionise.. pls thumbs up
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