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diff --git a/2780/CH8/EX8.8/Ex8_8.sce b/2780/CH8/EX8.8/Ex8_8.sce
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+clc
+//to calculate atomic number of the element
+//equation for balmer series in hydrogen spectrum is 1/lambda=R*((1/2^2)-(1/n^2))
+//for series limit n=infinity ,R=4/lambdainfinity i.e. R=4/364.6nm
+//X-ray wavelength of K series is 1/lambda=R*(z-1)^2*((1/1^2)-(1/n^2))
+lambda=0.1*10^-9
+R=4/(364.6*10^-9)
+//for n=infinity ,minimum wavelength of k series is given by
+z=sqrt(1/(lambda*R))+1
+disp("atomic number is z="+string(z)+"unitless")