simbolurile: ₁₀²⁰Ne ; ₁₀²¹Ne ; ₁₀²²Ne
stim ca Ar = (c1%xA1+c2%xA2+c3%xA3)/100
problema spune ca ₁₀²⁰Ne are c1% = 89,97%
c2% = ₁₀²¹Ne si c3% = ₁₀²²Ne
=>
20,193 = (89,97x20 + 21c2% + 22c3%)/100
89,97 + c2% + c3% = 100%
=>
219,9 = 21c2% + 22c3%
10,03 = c2% + c3% => c2% = 10,03- c3%
=>
219,9 = 21(10,03-c3%) + 22c3%
=> c3% = 9,27%
=> c2% = 0,76%