Boron has two stable isotopes, ¹°B(19%) and ¹¹B(81%). Average atomic weight

Boron Has Two Stable Isotopes B19 And B81 Average Atomic Chemistry QuestionBoron Has Two Stable Isotopes B19 And B81 Average Atomic Chemistry Question

Boron has two stable isotopes, ¹°B(19%) and ¹¹B(81%). Average atomic weight for boron in the periodic table is

Options

(a) 10.8
(b) 10.2
(c) 11.2
(d) 10

Correct Answer:

10.8

Explanation:

Avg Atomic Mass = (RA1 x MN1 + RA2 x MN2) / (RA1+ RA2)
Where RA= Relative Abundance, MN= Mass Number
= 19 x 10 + 81 x 11 / 100 = 10.81

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