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Element Atomic atomic atomic number of number number of
name symbol number mass protons of neutrons electrons
1. He
2.krypton
3. 82
4. 31
5. 35
6. 28
7. Gd
8.Palladium
9. 50.942
10.Beryllium
11. 22
12. 50
13. Ag
14.Yttrium
15. 89
16.Neon-18
17.Oxygen-15
18.Nitrogen-15
19.Carbon-15

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The solution provides detailed explanations and answer for the problem. Elements are charted.

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Note:
Atomic Mass = # Protons + # Neutrons
Atomic number ...

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