Question

Naturally occurring boron is 20%5B 10 and 80%5B11, the atomic weight of boron is
(A) 10.50
(B) 11.0
(C) 10.80
(D) 10.20​

Answer 1

Answer:

10.81 ( none a option is right)

Explanation:

Naturally occurring boron consists of two isotopes, whose atomic masses are 10.01 and 11.01. The atomic mass of natural boron is 10.81.