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19.9% of all boron atoms are 5B10 , 80.1% are 5B11. The approximate atomic mass of boron is

(the response should be like 10.0 or 09.9)

Option: 1

10.6


Option: 2

10.7


Option: 3

10.8


Option: 4

10.9


Answers (1)

best_answer

Atoms having the same atomic number but different mass numbers.

 Atomic mass = 

\frac{19.9\times10+80.1\times11}{100} = \frac{1080.1}{100} = 10.8

 

Posted by

Pankaj

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