Some Basic Concepts Of Chemistry Question 163

Question: Boron has two stable isotopes, 10B (19%) and 11B (81%). The atomic mass that should appear for boron in the periodic table is [CBSE PMT 1990]

Options:

A) 10.8

B) 10.2

C) 11.2

D) 10.0

Show Answer

Answer:

Correct Answer: A

Solution:

Atomic mass =10×19+81×11100 =190+891100 =1081100

=10.81



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