The alkaline earth metals Ba,Sr,Ca and Mg may | vedclass

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(A) The first ionization potential $(I.E.)$ of alkaline earth metals decreases down the group as the atomic size increases and the valence electrons a

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$Mg, Ca, Sr, Ba$

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(A) The first ionization potential $(I.E.)$ of alkaline earth metals decreases down the group as the atomic size increases and the valence electrons are further from the nucleus.The order of decreasing first ionization potential for the given elements is $Mg > Ca > Sr > Ba$.						Element			$I.E.$ $(kJ \ mol^{-1})$									$Mg$			$737$							$Ca$			$590$							$Sr$			$549$							$Ba$			$503$

The alkaline earth metals $Ba$,$Sr$,$Ca$ and $Mg$ may be arranged in the order of their decreasing first ionisation potential as

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