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P=1
N=0
1
Both of these diagrams contain the same content. Essentially what the models are stating is that Hydrogen has 1 proton, 0 neutrons and 1 electron in the first energy level.
P=7
N-7
2
5
These models of Nitrogen show us that there are 7 protons, 7 neutrons, and 7 electrons.
Helium has 2 protons, 2 neutrons and 2 electrons
P=2
N=2
2
By reading these models you can tell that argon has 18 protons, 22 neutrons and 18 electrons; 2 in the first level, 8 in the second and 8 in the third.
P=18
N=22
8
2
8