The average atomic mass of neon based on following data is 

Isotope	Relative abundance
${ }^{20}Ne$	0.9051
${ }^{21}Ne$	0.0027
${ }^{22}Ne$	0.0922

To calculate the neon atomic mass, we need to consider the isotopes of neon and their respective natural abundances. Neon consists of three stable isotopes:

• Neon-20: Mass = 19.9924 u, Abundance = 90.51%
• Neon-21: Mass = 20.9940 u, Abundance = 0.27%
• Neon-22: Mass = 21.9914 u, Abundance = 9.22%

Calculation Steps for the Neon Atomic Mass

We can calculate the neon atomic mass by following a step-by-step process:

Step 1: Convert Percentages to Decimal Form

• Neon-20: 90.51% = 0.9051
• Neon-21: 0.27% = 0.0027
• Neon-22: 9.22% = 0.0922

Step 2: Multiply Each Isotope's Mass by Its Abundance

We now multiply the mass of each isotope by its abundance in decimal form:

• Neon-20: 19.9924 u × 0.9051 = 18.1015 u
• Neon-21: 20.9940 u × 0.0027 = 0.0567 u
• Neon-22: 21.9914 u × 0.0922 = 2.0272 u

Step 3: Sum the Results to Find the Average Atomic Mass

Now, add the results from step 2:

• 18.1015 u + 0.0567 u + 2.0272 u = 20.1854 u