Chromium

**Chromium**
//Uses// Chromium is the 21st most abundant element in earth’s crust with an average concentration of 100ppm. It’s the metal on bikes, fancy kitchen equipment, and puts the “stainless” in stainless steel. It gives old cars a mirrored- metal look, and is a protective layer to stop surfaces from rusting. It is found in the environment due to the erosion of rocks containing 24Cr. It is also distributed by volcanic eruptions.

//Sub-Atomic Particles// The atomic mass of Chromium is 51.996 rounded to 52, this is telling us how much mass the atom of the element has. Its atomic number is 24. It has 24 protons, protons are all the positive charges found in the nucleus of an atom with the electrons which are the negative charged. Protons and Electrons are always the same number in this case the protons and electrons are 24. Neutrons have no electrical charge they are neutral, no positive no negative charge and chromium has 28 neutrons. Its symbol is Cr. Chromium's melting point is 1907 degrees Celsius or 3465 degrees F. Its boiling point is 2671 degrees celsius or 4840 degrees F.

//History// A long time ago, people used Chromium for the ancient bronze tips of crossbow bolts and swords. Approximately 2000 years later, on July 26th, 1761 Johann Gottlob Lehmann found a pretty orange-red mineral in Russia which he mistakenly thought it was lead. It was Crocoite. Also in 1770 Peter Simon Pallas found a red mineral that had useful properties as a pigment in paints. In 1798, Louis Vauquelin discovered that he could isolate metallic chromium by heating the oxide in a charcoal oven.

//Characteristics of my Element// Chromium is a member of the transition metals. It has remarkable magnetic properties, and is the only elemental solid which shows antiferromagnetic ordering at room temperature. It’s a silver, shiny, flashy, decorative metal, and can have different colors from red to green to orange to yellow, and gives the red to rubies, chromium is basically silver-gray. the chemical characteristics of my element is that Chromium is notable for its ability to form quintuple convalent bonds. But Chromium is unstable in oxygen, it immediately produces a thin oxide layer that is impermeable to oxygen and this protects the metal.


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