Chlorine element (Cl) is in group 17 and period 3 of a periodic table. Chlorine is in the p-block and it is classified as a halogen group element on the periodic table.
There is a lot more information related to chlorine which is mentioned in the Information Table given below.
So let’s dive right into it!
Table of contents
- Chlorine element (Information Table)
- Chlorine element in Periodic table
- Facts about Chlorine
- Properties of Chlorine
- Uses of Chlorine
Chlorine Element (Information Table)
The important data related to chlorine element is given in the table below.
|Appearance of chlorine||Pale yellow-green gas|
|Atomic number of chlorine||17|
|Symbol of chlorine||Cl|
|Atomic mass of chlorine||35.45 u|
|Protons, Neutrons & Electrons in chlorine||Protons: 17, Neutrons: 18, Electrons: 17|
|State of chlorine (at STP)||Gas|
|Group number of chlorine in periodic table||17|
|Period number of chlorine in periodic table||3|
|Block of chlorine in periodic table||p-block|
|Category of chlorine||Nonmetals (halogens)|
|Bohr model or Electrons per shell or Electrons arrangement in chlorine||2, 8, 7|
|Electron configuration of chlorine||[Ne] 3s2 3p5|
|Orbital diagram of chlorine|
|Valence electrons in chlorine||7|
|Electronegativity of chlorine (on pauling scale)||3.16|
|Atomic radius of chlorine (van der Waals radius)||175 picometers|
|Density of chlorine||3.214 g/L|
|1st ionization energy of chlorine||12.968 eV|
|Main isotope of chlorine||35Cl and 37Cl|
|Melting point of chlorine (Cl2)||171.6 K or -101.5 °C or -105.7 °F|
|Boiling point of chlorine (Cl2)||239.11 K or -34.04 °C or -29.27 °F|
|Crystal structure of chlorine||Orthorhombic|
|Discovery of chlorine||By Carl Wilhelm Scheele in 1774|
Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).
Chlorine element in Periodic table
The Chlorine element (Cl) has the atomic number 17 and is located in group 17 and period 3. Chlorine is a nonmetal and it is classified as a halogen element.
Facts about chlorine
Here are a few interesting facts about chlorine element.
- The chlorine element is given its name from the Greek word “khloros” which means “greenish-yellow” (which is the appearance of the chlorine gas).
- Chlorine is the 3rd most abundant element present in the ocean.
- Chlorine is the 21st most abundant element present in the earth’s crust.
- Sea water has a very large amount of chlorine (present in NaCl in seawater).
- Chlorine is also present in the human body.
- The chlorine always exists as a diatomic molecule (i.e Cl2).
- We intake chlorine from food (i.e table salt (NaCl)). Inhaling a pure chlorine gas is toxic for the human body.
Properties of chlorine
Here is a list of some physical properties and chemical properties of chlorine.
Physical properties of chlorine
- Chlorine gas has a pale yellow-green color appearance.
- Chlorine gas has a strong smell.
- The atomic mass of chlorine is 35.45 u and its density is 3.214 g/L.
- The melting point and boiling point of chlorine (Cl2) is 171.6 K and 239.11 K respectively.
Chemical properties of chlorine
- Chlorine shows chemical reaction with many elements because it has higher electronegativity and high electron affinity.
- Chlorine is a reactive nonmetal and hence it is always found with other compounds.
- Chlorine does not show any reaction with lighter noble gases, because the noble gases are chemically inert.
- Chlorine forms a white mist when it reacts with ammonia (NH3).
- Chlorine gas is liberated on electrolysis of salt water.
- Chlorine is a nonflammable gas and it is non explosive in nature.
- Chlorine is also added to drinking water to kill bacteria and microorganisms.
Uses of chlorine
Here are some uses of the chlorine element.
- Chlorine was once used as a chemical weapon which can burn the skin.
- Chlorine is also used in manufacturing of medicines, disinfectants as well as insecticides.
- The paper industries, plastic industries as well as dyes industries also used chlorine.
- Polyvinyl Chloride (PVC) is a polymer that has chlorine in it.