Atoms And Nuclei Question 332

Question: Atomic weight of boron is 10.81 and it has two isotopes 5B10 and 5B11 . Then ratio of 5B10:5B11 in nature would be

Options:

A) 19 : 81

B) 10 : 11

C) 15 : 16

D) 81 : 19

Show Answer

Answer:

Correct Answer: A

Solution:

  • Let the percentage of B10 atoms be x, then average atomic weight =10x+11(100x)100=10.81x=19
    ,NB10NB11=1981


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