Arsenic occurs naturally in the environment and is often found within the Earth's crust, extending its presence into soil, water and rock. Arsenic is also forced into the air during certain chemical processes, causing en... More » Science Chemistry

Arsenic is used as a preservative, pesticide, herbicide and as a semiconductor enhancement. The toxic element is found in inorganic and organic compounds and can cause grave problems if humans come into contact with it. More » Science Chemistry

Arsenic is typically classified as a metalloid element and may be found in several mineral forms in nature. It is commonly dispersed in small amounts in soil, as well as in larger amounts in gold, copper, lead and zinc o... More »

Arsenic is a gray or yellow crystalline that often looks like a jagged rock when it is in its natural state. It is typically somewhat shiny, resembling silver. More »

Arsenic is not particularly reactive though yellow arsenic is the most reactive and reacts with halogens under controlled conditions, fluorine and slowly with air (oxidization only). Arsenic does not react with water and... More »

Nitrogen can be found in all living organisms on Earth while also being present in soil, water and air. It is an important component in biological compounds found all throughout nature. More »

Fluorine is found in the minerals fluorapatite, cryolite and fluorspar in the Earth's crust. It is not found as a free element in nature because it is too reactive. More » Science Chemistry