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diff --git a/1427/CH20/EX20.12/20_12.sce b/1427/CH20/EX20.12/20_12.sce
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+//ques-20.12
+//Calculating mass defect and binding energy per nucleon for sodium atom
+clc
+mh=1.008;//mass of hydrogen (in amu)
+mn=1.0072;//mass of neutron (in amu)
+M=23.0092;//atomic mass of sodium (in amu)
+dm=11*mh+12*mn-M;//mass defect
+BE=(dm*931)/23;
+printf("The mass defect is %.4f amu binding energy per nucleon for Sodium atom is %.3f Mev.",dm,BE);