1.

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

Answer»

Mg,CA,Sr,BA
Ca,Sr,Ba,Mg
Sr,Ba,Mg,Ca
Ba,Mg,Ca,Sr

Solution :`{:("ELEMENT-","Mg","Ca","Sr","Ba"),("I.E.",737,590,549,503):}`


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