Cl (Chlorine) is an element with position number 17 in the periodic table.
Located in the III period. Melting point: -101 ℃. Density: 0.00295 g/cm3.
Electronic configuration of the Chlorine atom: 1s2 2s2 2p6 3s2 3p5
Reduced electronic configuration Cl: [Ne] 3s2 3p5
Below is the electronic diagram of the Chlorine atom
Distribution of electrons over energy levels in the Cl atom 1-st level (K): 2 2-st level (L): 8 3-st level (M): 7
Valence electrons of Chlorine
The number of valence electrons in a Chlorine atom - 7.
Below are their quantum numbers (N - energy, L - angular momentum, M - magnetic moment, S - spin )
Orbital
N
L
M
S
s
3
0
0
+1/2
s
3
0
0
-1/2
p
3
1
-1
+1/2
p
3
1
0
+1/2
p
3
1
1
+1/2
p
3
1
-1
-1/2
p
3
1
0
-1/2
Oxidation states of Chlorine: -1, +1, +2, +3, +4, +5, +6, +7
Distribution of electrons over energy levels in the Cl atom 
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