Question

SEP Use Mathematics The mass of an isotope can be approximated by adding together the number of protons and neutrons in its nucleus. For example, a carbon- 12 nucleus has 6 protons and 6 neutrons, and its mass is approximately 12 amu. Look at the models for the two isotopes of boron. Each model shows the isotope's natural percent abundance and the composition of its nucleus. Use the data to calculate the approximate atomic mass of boron.

Answer 1

The relative atomic number of boron is 5 + 5 = 10 by the method of rough estimation.

What is the relative atomic mass of boron?

We must recall that the relative atomic mass of an element could be obtained as the sum of the product all the masses of al the isotope of the elements and their relative abundances. The reason why the relative atomic mass of an element is not a whole number is because all the isotopes must be taken into account.

Now, given the fact that we could use the number of protons and neutrons to obtain the relative atomic mass by the method of rough estimation, we can now apply the method to obtain the relative atomic mass of the element.

Hence, to obtain the relative atomic mass of boron, we have to recall that the number of protons in boron is 5 and the number of neutrons in boron is 5. Thus the relative atomic number of boron is 5 + 5 = 10 by the method of rough estimation.

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