Desha Dent
3rd Hr.
Who and when was this element
discovered??
By a French man named Louis
Vaunquelin in 1797
What methods are used to extract
this element from nature?
A two step process called speciation it
performs the extraction with
introversion of the two predominant
species
Availability, abundance on earth, and
where it is found in nature
Availability & abundance
• The element chromium is
9th most abundant element
compound in earths crust
• Its abundance is 102 parts
per million by weight, 40
parts per million by moles
Where it is found
• The principle ore is found in
nature in places like
Zimbabwe, Russia, Turkey,
Iran and ect.
The properties and characteristics of
the element
• Chromium has a melting point of 1857+/-20°C,
boiling point of 2672°C, specific gravity of 7.18
to 7.20 (20°C), with valences usually 2, 3, or 6.
The metal is a lustrous steel-gray color which
takes a high polish. It is hard and resistant to
corrosion. Chromium has a high melting point,
stable crystalline structure, and moderate
thermal expansion.
The type of compounds the
element forms
All compounds of chromium are colored; the most
important are the chromates of sodium and potassium and
the dichromates and the potassium and ammonium chrome
alums. The dichromates are used as oxidizing agents in
quantitative analysis, also in tanning leather.Other
compounds are of industrial value; lead chromate is chrome
yellow, a valued pigment. Chromium compounds are used in
the textile industry as mordants, and by the aircraft and
other industries for anodizing aluminum.
Common everyday uses of the
element
Chromium is used to harden steel. It is a
component of stainless steel and many other
alloys. The metal is commonly used for plating to
produce a shiny, hard surface that is resistant to
corrosion. Chromium is used as a catalyst. It is
added to glass to produce an emerald green color.
How the element impacts your life
It is used to beautify the things we wear like
rubies, basically jewelry. It also hardens still
and we use steel a lot, like in things like cars
so it is a very important element.
Amazing facts about the element
• Comes from the Greek word for color, chroma.
• Chromium was discovered while
experimenting with a material known as
Siberian red lead, also known as the mineral
crocoite (PbCrO4), in 1797.
• Chromium forms many colorful compounds
that have industrial uses.
Cost to obtain or make the element if
available
• Cost, pure: $20 per 100g
• Cost, bulk: $ per 100g
The toxicity level L.D. 50 dose if
available
Chromium
Atomic Number: 24
Atomic Symbol: Cr
Atomic Weight: 51.996
Electron Configuration: [Ar]4s13d5
Total Isotopes 28
Total Isomers 2
Radioactive Isotopes 22
Stable Isotopes 4