ALUMC Structure od 119. Atomic weight of an element is 39. In its nucleus, of neutrons is one more than number of protons. No of proton, neutrons and electrons will be- 41X40 20 40

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let no of protons ( =x ) Then no of neutrons ( =x+1 ) now ( x+x+1=39 ) As at weight ( =mathrm{p}+mathrm{n} ) So ( 2 x+1=39 ) ( 2 x=38 ) ( x=19 ) So no of protons =Number of Electrons ( =19 ) And Number of Neutrons ( =19+1=20 ) The name of the element is Potassium

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