Answer:
The boron-11 should be more abundant
Explanation:
Atomic weight in the periodic table is an average value related to the percentaje of abundance of each isotope of the element.
Given that boron has only two isotopes (10 and 11), if their abundance would be 50%:
[tex]Ar=10*0.5+11*0.5=10.5[/tex]
- If Ar<10.5, the boron 10 will be more abundant
- If Ar>10.5 the boron 11 will be more abundant
Knowing that the boron's Ar is 10.81, we can afirm that boron-11 is more abundant.
