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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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