बोरॉन के दो स्थायी समस्थानिक `""_(5)^(10)B` एवं `""_(5)^(11)B` है | उनके द्रव्यमान क्रमश: 10.01294 u एवं 11.00931 u एवं बोरॉन का परमाणु भार 10.811 u है | `""_(5)^(10)B` एवं `""_(5)^(11)B` की बहुलता ज्ञात कीजिए |

(a) Two stable isotopes of lithium ""_(3)^(6)Li and ""_(3)^(7)Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium. (b) Boron has two stable isotopes, ""_(5)^(10)B and ""_(5)^(11)B . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u . Find the abundances of ""_(5)^(10)B and ""_(5)^(11)B .

(a) Two stable isotopes of lithium ""_(3)^(6)Li and ""_(3)^(7)Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium. (b) Boron has two stable isotopes, ""_(5)^(10)B and ""_(5)^(11)B . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u . Find the abundances of ""_(5)^(10)B and ""_(5)^(11)B .

Broron has two stable isotopes, ._(5)^(10)B and ._(5)^(11)B . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of ._(5)^(10)B and ._(5)^(11)B .

Boron has two stable isotopes, "_5^10B and "_5^11B . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of "_5^10B and "_5^11B .

Boron has two stable isotopes "_5^10B and "_5^11B . There respective masses are 10.01294 u and 11.00931 u and the atomic mass of boron is 10.811 u. Find the abundances of "_5^10B and "_5^11B .