Odpowiedzi

2011-07-04T12:36:45+02:00

l. ptoronów = 19

A₁=l. protonów+l. neutronów

A₁=20+19=39

 

A₁=39

%x₁=94,84%

%x₂=100%-94,84%=5,16%

mat=39,10u

A₂=?

 

mat=A₁*%x₁+A₂*%x₂ / 100%

39,10=39*94,84%+A₂*5,16% / 100%     /*100%

3910=3698,76+5,16A₂

5,16A₂=211,24     /:5,16

A₂=40,9≈41

 

A₁=39

A₂=41

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