1.

The alkaline earth metal with least density is

Answer»

MG
Be
Sr
Ca

Solution :As the nuclear charge increases and size decreases, density increases. But density slightly decreases upto CLACIUM and then increases considerably upto radium due to a hard difference in the crystal STRUCTURE of these elements.
`{:(,"Be","Mg","Ca","Sr","BA","Ra"),("Density (g/mL)",1.84,1.74,1.55,2.63,3.59,5.5):}`


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