Some Basic Concepts of Chemistry - Result Question 28

####27. Boron has two stable isotopes, 10B(19 and 11B(81. Average atomic weight for boron in the periodic table is

[1990]

(a) 10.8

(b) 10.2

(c) 11.2

(d) 10.0

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Solution:

  1. (a) Average atomic mass =19×10+81×11100 =10.81


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