Chromium is a chemical element with the symbol Cr and atomic number 24. It is a hard, lustrous, steel-gray metal that is highly resistant to corrosion. Chromium is commonly found in the Earth'scrust and is used in various industrial applications.
While chromium is an essential trace element for human health, exposure to high levels of certain forms of chromium, such as hexavalent chromium, can be harmful. It is important to handle and dispose of chromium compounds properly to prevent environmental contamination and health risks.
Study Guide
If you are studying chromium, here are some key points to focus on:
Understand the electronic configuration of chromium and its position in the periodic table.
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.