17
Cl
Chlorine
Chlorine
Chlorine (Cl)
Halogens · Gas · Period 3 · Group 17
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Element Properties
- Atomic Number
- 17
- Symbol
- Cl
- Atomic Mass
- 35.45
- Category
- Halogens
- Standard State
- Gas
- Period
- 3
- Group
- 17
- Electronegativity
- 3.16
- Atomic Radius
- 175
- Ionization Energy
- 12.97
- Electron Affinity
- 3.62
- Oxidation States
- +7, +5, +1, -1
- Melting Point
- 171.65 K (-101.5 °C)
- Boiling Point
- 239.11 K (-34.04 °C)
- Density
- 0.003214
- Electron Configuration
- [Ne]3s2 3p5
- Year Discovered
- 1774
Frequently asked questions
What is the atomic number of Chlorine?
The atomic number of Chlorine is 17, which equals the number of protons in its nucleus.
What is the atomic mass of Chlorine?
The atomic mass of Chlorine is approximately 35.45 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Chlorine?
The electron configuration of Chlorine is [Ne]3s2 3p5.
Where is Chlorine in the periodic table?
Chlorine is located in period 3, group 17.
When was Chlorine discovered?
Chlorine was discovered in 1774.
Related elements
Same group
9
F
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Br
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79.9
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I
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126.904
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At
Astatine
209.987
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Ts
Tennessine
294.211