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(distance of third orbit-distance of second orbit)from nucleus = distance between 2nd and 3rd orbit
d3 = 0.529*(n^2/z)*10^-10m = 0.529*9*10^-10m
d2 = 0.529*4*10^-10m
d3-d2 = 0.529*5*10^-10m
= 2.645*10^-10m = distance between 2nd and 3rd orbit..
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