Boron has two isotopes B10 and B11 whose relative abundances are 20% and 80% respecctivly Atomic weight of Boron - Science - Atoms and Molecules

Question

Boron has two isotopes B10 and B11 whose relative abundances are
20% and 80% respecctivly Atomic weight of Boron is :A) 10B)11C)10
5D)10 8please show the answer with method

Anuradha Puri · Accepted Answer

Average atomic mass = sum of product of relative abundance and
atomic mass of isotopes

Average atomic mass of boron =

= (10 x 20/100) + (11 x 80/100)

= 2 + 8 8

= 10 8 u

Hence, option D) is correct

Boron has two isotopes B10 and B11 whose relative abundances are 20% and 80% respecctivly. Atomic weight of Boron is :A) 10B)11C)10.5D)10.8please show the answer with method