1.

Select from each of the following sets those elements which belong to the same groupof the periodic table ?

Answer»

At. Nos. `12,4,88`
At. Nos. `9,16,35,3`
At nos. `11,19,27,5`
At.nos, `24,47,42,55`

Solution :Atomic numbers `:12 (Mg) , 38 (Sr) , 4 (Be) , 88 (Ra)` REPRESENT ALKALINE earth METALS.


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