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7.Boron has two stable isotopes, 10B (19%) and11B (81%). Calculate average atomic weight ofboron in the periodic table. [AIPMT 1990(A) 10.8(C) 11.2(B) 10.2(D) 10.0

Answer»

avg at. mass = %1*isotope+%2*isotope/100 = 19*10+81*11/100 = 190+891/100 = 1081/100 = 10.8



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