Element Properties: 16-22 atomic number

MIRAMAR, Fla. - July 6, 2021 - PRLog -- SULFUR
Sulfur has three allotropic forms, rhombic sulfur- stable at room temperature, monoclinic sulfur- which is stable between 95.6°C and its melting point, and amorphous sulfur- a plastic rubbery form. All forms slowly revert back to the rhombic form if allowed to stand at room temperature.

CHLORINE
Chlorine has a sharp, disagreeable odor, which attacks the skin and mucous membranes of the nose and throat. Much chlorine is used to bleach wood pulp for the paper industry, as well as cotton and linen fabrics. Tap water and swimming pool water and both chlorinated to kill bacteria.

ARGON
Argon is a colorless, odorless, tasteless monatomic inert gas. It is obtained from the fractional distillation of liquid air. It is used with nitrogen in filling electric light bulbs, and is used with helium as an inert atmosphere in scientific work.

POTASSIUM
Potassium is a soft, silvery-white alkali metal that is brittle at low temperatures and tarnishes when exposed to air. It is a major essential element for plant growth, and extremely reactive.

CALCIUM
Calcium is just behind aluminum and iron in the list of abundant metals, and makes up 3% of the earth's crust. Calcium carbonate can be found as limestone, marble, chalk, seashells, and calcite. It is found as dolomite when combined with magnesium. Calcium is a good reducing agent and forms heavy hydroxide coats when in contact with moist air.

SCANDIUM (https://www.edgetechree.com/rare-earth-metals/scandium-me...)
Atomic symbol: Sc
Atomic weight: 44.955910
Atomic number: 21
Electron configuration: 2-8-9-2
Oxidation states: +3
State of matter: solid
Heavy metal, brittle
Discovered in 1879 by Lars Fredrick Nilson
Boils at 2832°C, melts at 1539°C
Notes:
Scandium is a rare earth metal widely dispersed in nature. It has very few uses, and its low density and high melting point suggest applications as an alloying agent for devices requiring lightweight metals. Scandium emits strong gamma radiation with an 85-day half-life. The chemistry of this element is similar to aluminum and titanium.

TITANIUM (https://www.edge-techind.com/category/Titanium-24-1.html)
Atomic symbol: Ti
Atomic weight: 47.88
Atomic number: 22
Electron configuration: 2-8-10-2
Oxidation states: +2, +3, +4
State of matter: solid
Heavy metal, brittle
Discovered in 1795 by Martain Heinrich Klaproth
Boils at 3260°C, melts at 1675°C
Notes:
Titanium is a dark gray lustrous metal that constitutes 0.6% of the Earth's crust. It is very light and strong, and fairly corrosion resistant. Its use as a structural metal is increasing. It is extremely reactive with both oxygen and nitrogen. Its principal uses are as special gears and tools.