Question

what is the isotope of name of boron with 5 protons and 6 neutrons *
boron-10
boron-12
boron-9
boron-11
what percent of boron would be boron-10 *
20%
80%
60%
40%
what percent of boron would be boron-11 *
40%
80%

Explanation:

Step1: Calculate mass number of boron isotope

The mass number of an isotope is the sum of protons and neutrons. Given 5 protons and 6 neutrons, mass number = 5 + 6 = 11. So the isotope is Boron - 11.

Step2: Recall natural - abundance of boron isotopes

The natural - abundance of Boron - 10 is about 20% and Boron - 11 is about 80%.

Answer:

1. D. Boron - 11
2. A. 20%
3. B. 80%