Chromium Element in Periodic Table | Atomic Number Atomic Mass
The chemical element Chromium is a steely-grey, lustrous, hard and brittle metal. Its atomic number is 24 and represented by the symbol Cr. It is d-block transition metal. In the periodic table of elements Cr is a member of group 6 and period 4. Cr is the 22nd most common element found in the Earth's crust, but it is not found in its free metal form.Instead it is mainly found in chromite ore. Four known isotopes, 52Cr, 53Cr, 54Cr and 52Cr are present in naturally occurring Chromium. 52Cr, 53Cr, 54Cr are the most stable isotopes.
Uses Of Chromium Element:
- It is used in manufacture of stainless steel and other alloys.
- Chromium compounds are used as industrial catalysts
- Chromium compounds are used as pigments in green, yellow, red and orange colours.
- For polishing steel to shine like mirror, chromium plating is used. Chromium plated plastics are commonly used in sanitary fittings.
- Chromium is a key element for humans because it helps to use glucose. However, it is poisonous in excess.
Chromium Element Information:
Discovery year: 1797, 1798
Discovered by: Louis Nicolas Vauquelin
Atomic number: 24
Relative atomic mass: 51.996
Electron configuration: [Ar] 3d5 4s1
Other elements in the same block:
Scandium, Titanium, Vanadium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc, Yttrium, Zirconium, Niobium, Molybdenum, Technetium, Ruthenium, Rhodium, Palladium, Silver, Cadmium, Lanthanum, Hafnium, Tantalum, Tungsten, Rhenium, Osmium, Iridium, Platinum, Gold, Mercury, Actinium, Rutherfordium, Dubnium, Seaborgium, Bohrium, Hassium, Meitnerium, Darmstadtium, Roentgenium and Copernicium are the elements in the same block.
Period: period 4
Other elements in the same period:
Group: group 6
Other elements in the same group:
Other elements in the same orbital:
Key isotopes: 52Cr
Melting point: 1907°C, 3465°F, 2180 K
Boiling point: 2671°C, 4840°F, 2944 K
Element category: transition metal
Density (g cm−3): 7.15
CAS number: 7440-47-3
Color: silvery metallic
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