Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, gray-white metal that is commonly found in minerals such as pyrolusite, rhodochrosite, and manganite.
Manganese can have both beneficial and detrimental effects on the environment. While it is necessary for the healthy functioning of plants and animals, excessive exposure to manganese can lead to neurological disorders in humans and other organisms.
Study Guide:
Here are some key points to remember when studying manganese:
Energy - A. Energy is involved in all physical and chemical processes. It is conserved, and can be transformed from one form to another and into work. At the atomic and nuclear levels energy is not continuous but exists in discrete amounts. Energy and mass are related through Einstein's equation E=mc 2 . B. The properties of atomic nuclei are responsible for energy-related phenomena such as radioactivity, fission and fusion. C. Changes in entropy and energy that accompany chemical reactions influence reaction paths. Chemical reactions result in the release or absorption of energy. D. The theory of electromagnetism explains that electricity and magnetism are closely related. Electric charges are the source of electric fields. Moving charges generate magnetic fields. E. Waves are the propagation of a disturbance. They transport energy and momentum but do not transport matter.
Relate temperature to the average molecular kinetic energy.