Answer:
If the natural abundance of boron-11 is 80.1%, then the natural abundance of boron-10, the other stable isotope of boron, is 100% - 80.1% = 19.9%.
To determine how many of the 7,000 boron atoms are the boron-11 isotope, we can use the following steps:
Calculate the number of boron-10 atoms:
19.9% x 7,000 = 1,393
Calculate the number of boron-11 atoms:
80.1% x 7,000 = 5,607
Therefore, out of 7,000 boron atoms, 5,607 are the boron-11 isotope.
Step-by-step explanation: