B has isotope ^B(19%) and ^11B(81%) the atomic mss of B IS
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the atomic mass is not specified in the first one
I used 10 in the case of B(19%) the mass I got is 10.81
10*19+11*81/100
I used 10 in the case of B(19%) the mass I got is 10.81
10*19+11*81/100
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