. Boron has two stable isotopes
10 B(19%) and ''B(81%). Calculate average at. wt. of boron in the periodic table.
Correct Option Is :(a)
The percentage occurrence of all stable isotopes of a given element determines the average atomic mass. As a result, the average atomic mass can be estimated as follows-
Average atomic mass =19×10+81×11/100=10.81
Hence, the correct answer is option 1.