Chlorine - Cl

Taylor McCoy

Chlorine History

  • 17 protons, 17 electrons, and 18 neutrons.
  • Discovered in 1774 by Carl William Scheele in Sweden.
  • The original name was "chloros" meaning pale green in Greek.
  • Scheele obtained it through a reaction of the mineral pyrolusite with hydrochloric acid, thinking oxygen gas would be produced.
  • Sir Humphry Davy later confirmed chlorine to be an element in 1810, and he also named it.

Properties of chlorine and some uses:

  • Electronegativity- 3
  • Pure element has the form of a diatomic green gas and 2.5 times heavier than air.
  • Very strong, suffocating odor and poisonous.
  • In solid and liquid form it's a bleaching and disinfecting agent.
  • Chlorine is very important for water purification and mustard gas.

Compounds with chlorine:

  • Aluminum chlorohydrate- antipersperiants
  • Sodium chloride- table salt
  • Hydrogen chloride- when mixed with H20, hydrochloric acid forms.

Sodium chloride

  • NaCl (aka table salt)
  • 1:1 ratio
  • Synthesis reaction

Group 7a (17)

  • Group 17 is the halogens, they only need 1 electron to be stable so they are very reactive.
  • Halogens are generally poisonous, all with a different levels of toxicity.
  • They are poor conductors of heat and electricity.
  • They can exist usually in solids, liquids, and gases.
  • Halogens can separate and combine with surrounding elements and create compounds.
Chlorine and Milk