1.

Which of the two elements would be more reactive, element A of atomic number 36 or element B of atomic number 19 ?

Answer»

SOLUTION :The electronic configurations of elements A and B are given below.
`{:(A(36),2,8,18,8),(B(19),2,8,8,1):}`
Since the outermost shell of element A is completely FILLED, it is stable and unreactive . The outermost shell of element B contains ONE electron only . Hence , it is more REACTIVE.


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