Boron exists in two isotopes, boron-10 and boron-11. based on the atomic mass, which isotope should be more abundant

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%:

Knowing that the boron's Ar is 10.81, we can afirm that boron-11 is more abundant.

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