FLUORINE
Atomic symbol: F
Atomic weight: 18.9984032
Atomic number: 9
Electron configuration: 2-7
Oxidation states: -1
State of matter: gas Non-metal
Discovered in 1886 by Henri Moissan
Boils at -188°C, freezes at -220°C
Notes:
Fluorine is the most active member of the halogen family, and produces the most stable compounds. It is very poisonous because of its great activity. It is so active that it is not found free in nature, only in a combined state, and is very abundant. It occurs as either the mineral fluorine, or the mineral cryolite. Freon, the refrigerant, contains fluorine. Cryolite, or sodium aluminum fluoride, is an important flux in the electrolytic production of aluminum metal. Compounds of fluorine and carbon are important because of their heat and fire resistance. Fluorine is found in tap water and toothpaste, which had beneficial effects on teeth. Other fluorine compounds are used as insecticides and wood preservatives.
NEON
Atomic symbol: Ne
Atomic weight: 20.1797
Atomic number: 10
Electron configuration: 2-8
Oxidation states: 0
State of matter: gas
Noble gas
Discovered in 1898 by Sir William Ramsay and Morris W. Travers
Boils at -246°C, melts at -248.7°C
Notes:
Neon is obtained from the fractional distillation of liquid air. Its main use is in neon signs. Neon signs are made of helium, neon, argon, or mercury at different pressures. These are then put into different colored glass, which gives off different colors.
SODIUM
Atomic symbol: Na
Atomic weight: 22.989768
Atomic number: 11
Electron configuration: 2-8-1
Oxidation states: +1
State of matter: solid
Light metal
Discovered in 1807 by Sir Humphry Davy
Boils at 883°C, melts at 97.8°C
Notes:
Sodium is a light silvery-white metal, lustrous when freshly cut, but tarnishes when exposed to air, becoming dull and gray. It is too active to be found in nature, and reacts vigorously with water, exploding upon contact with a large chunk. Most metallic sodium is used in the manufacture of tetraethyl lead, an alternative for gas. Other uses are the manufacture of a variety of organic chemicals, and the reduction of titanium metal. It is also a good electron source for photoelectric cells and cyclotrons.
Atomic symbol: Mg
Atomic weight: 24.3050
Atomic number: 12
Electron configuration: 2-8-2
Oxidation states: +2
State of matter: solid
Light metal
Discovered in 1808 by Sir Humphry Davy
Boils at 1090°C, melts at 649°C
Notes:
Magnesium is one of the most common elements in the earth’s crust. It burns with a brilliant white color, and slowly oxidizes in moist air. It is an important structural metal, often used in either pure or alloyed form with aluminum in the construction of aircraft. It is also frequently used in the production of objects requiring a light weight. Powdered magnesium is sometimes used in place of aluminum in the thermite reaction.
ALUMINUM
Atomic symbol: Al
Atomic weight: 26.981539
Atomic number: 13
Electron configuration: 2-8-3
Oxidation states: +3
State of matter: solid
Heavy metal: low melting
Discovered in 1827 by Friedrich W