The first quantum number (n) represents the energy level (shell), so for a 1s2 electron, it would have a value of 1.
n = 2
n=1
3
[Ne] 3s2, 3p3
First find the atomic numbers of phosphorus and calcium (x3) Then add the numbers together to find the overall atomic number Next divide the atomic number of phosphorus by the overall atomic number and multiply by the number. P=15 Cl=20x3=60 60+15=75 15/75= 0.2x100=20% I think this is right, hope it helps
N = 2
n=2
n = 2
n=1
3
n=3
The energy level an electron gives
The energy level the electron is in
n=3
It's the azimuthal quantum number. It specifies the angular momentum of the orbital, which can broadly speaking be thought of as its "shape." (The reason I'm putting that in quotation marks is that it's possible for two orbitals with the same azimuthal quantum number to appear rather different in overall shape.)
The shape of the electron cloud is determined by the secondary quantum number. The first is n, or the energy level, the second is the sublevel, the third is the specific cloud, and the fourth is the spin.
The energy level the electron is in