Chlorine gas is greenish yellow in appearance. The word “chlorine” comes from the Greek word “chloros,” meaning greenish yellow. This element is a halogen belonging to group 17 on the periodic table. Its chemical symbol is Cl, and it has an atomic weight of 35.453 grams per mole.
In nature, chlorine does not exist in free form because it readily combines with many other elements to form compounds. Carl Wilhelm Scheele discovered chlorine in 1774. Chlorine is used industrially in disinfectants, textile production, solvents and plastics. Chlorine is useful in the manufacture of compounds like chloroform and potassium chloride. Chlorine gas is a very dangerous substance that is an irritant to the respiratory system. Exposure to high concentrations of this gas can cause serious long-term health effects.Learn More
Iron rusts when it comes in contact with oxygen and water. It rusts faster in acid rain and salty water. Both oxygen and water are necessary for rusting, which is an oxidation reaction.Full Answer >
Aluminum reacts with oxygen to form a layer of aluminum oxide on the outside of the metal, according to HowStuffWorks. This thin layer protects the underlying metal from corrosion caused by oxygen, water or other chemicals. Aluminum burns in oxygen with a white flame to form the trioxide aluminum (III) oxide, says WebElements. Chemists write the chemical reaction between aluminum and oxygen as: 4Al+ 3O2 = 2Al2O3.Full Answer >
Boron was discovered in 1808. French chemists Joseph-Louis Gay-Lussac and Louis-Jaques Thénard and English chemist Sir Humphry Davy independently isolated the element, and all three are credited with its discovery.Full Answer >
Noble gases are inert due to their complete electron shells. Their stable atomic structure makes the energy required to add or remove an electron prohibitively high, so the noble gases do not form compounds in natural conditions.Full Answer >