Question

Neon has 3 isotopes, Neon-20, Neon-21 & Neon-22. The relative abundance of 20Ne is 91%, 21Ne is 0.25% and 22Ne is

8.75%. Calculate the average atomic mass for neon expected to be found on the periodic table. (Show all work)

Answer 1

To calculate the average atomic mass of neon, we need to consider the relative abundance of each isotope and its respective mass. Using the given percentages and masses, we can calculate the average atomic mass to be 20.179 amu.

Step-by-step explanation:

To calculate the average atomic mass of neon, we need to consider the relative abundance of each isotope and its respective mass. Given that Neon-20 has a relative abundance of 91%, Neon-21 has a relative abundance of 0.25%, and Neon-22 has a relative abundance of 8.75%, we can calculate the average atomic mass as follows:

1. Convert the relative abundances to decimals by dividing each percentage by 100.
2. Multiply each decimal by its respective isotope's mass.
3. Add up the products obtained in step 2 to get the average atomic mass.

Using the given information, the calculations would be: (0.91 * 20.00 amu) + (0.0025 * 21.00 amu) + (0.0875 * 22.00 amu) = 20.179 amu. Therefore, the average atomic mass of neon expected to be found on the periodic table is 20.179 amu.