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tiara143
The atomic mass of neon is 20 amu.

20 amu = 10 p + 10 n

Neon has an atomic number , Z = 10 and contains 10 protons and 10 neutrons. It can completely filled electron shells and it is thus a noble gas.  i.e. the number of 10 protons in the nucleus which defines the element. 

Average Atomic mass = 20.2 amu

To calculate the average atomic mass of neon, we need to know it's naturally occurring isotopes, and the masses of these it's different isotopes.

The isotopes of neon are;

  • Ne-20; 90.92%  of the atoms are Ne-20 with 10 neutrons and has a mass of  19.99amu .
  •  Ne-21; 0.3%  of the atoms are Ne -21, with 11 neutrons and has a mass of  20.99amu .
  • Ne-22; 8.85%  of the atoms are  Ne -22,  with 12 neutrons and has a mass of  21.99amu .

Thus;

Average Atomic mass = (90.92% × 19.99) + (0.3% × 20.99) + (8.85% × 21.99)

Average Atomic mass = 20.184 amu

To the nearest tenth gives 20.2 amu

Read more at; brainly.com/question/11657760

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