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- Name: Chlorine
- Symbol: Cl
- Atomic Number: 17
- Atomic Weight: 35.453 u
- Period: 3
- Group: 17
21 Chlorine Facts for Kids
- Chlorine is a chemical element on the periodic table.
- Chlorine was first discovery and isolated in 1774 by German-Swedish chemist Carl Wilhelm Scheele.
- Chlorine was identified as a chemical element in 1809 by Cornish chemist Sir Humphry Davy.
- Chlorine is a gas at room temperature.
- Chlorine has a yellow-green color when at room tempature.
- The symbol for chlorine is Cl.
- The atomic number for chlorine is 17.
- The standard atomic weight for carbon is 35.453 u.
- Chlorine is in the reactive nonmetal element category of the periodic table.
- Chlorine is a period 3 chemical element, which is the third row of the periodic table.
- Chlorine is a group 17 chemical element, which is the halogens group.
- Chlorine has two stable isotopes.
- The two stable chlorine isotopes are 35Cl and 37Cl.
- The melting point for chlorine is -150.7 °F (-101.5 °C).
- The boiling point for chlorine is -29.27 °F (-34.04 °C).
- Chlorine is the 21st most abundant chemical element found in the Earth’s crust.
- The most common chlorine element found on Earth is sodium chloride (salt).
- Chlorine is used to purify water, like drinking water, wastewater and pool water.
- Chlorine is used as a disinfectant in many different house cleaning products.
- Chlorine gas is toxic to humans and can damage the eyes, skin and respiratory system.
- Chlorine gas was used as a chemical weapon during World War 1.
Additional Resources on the Chemical Element Chlorine
- What is Chlorine? – Learn what chlorine is and what it is used for on the American Chemistry Council website.
- Facts About Chlorine – Discover more amazing facts about chlorine on the Live Science website.
- Chlorine Facts – Find more important facts about chlorine on the CDC website.
- Chlorine – Britannica – Read about chlorine, its uses and functions on the Britannica website.