Chromium Metal | Properties | Uses | Facts - Elements and Compounds


Thursday, March 23, 2023

Chromium Metal | Properties | Uses | Facts

Properties Uses and Facts about Zinc Metal

    What is Chromium

    Chromium metal is classified as a transition metal, and chemically it is an element. Chromium has an atomic mass of 51.996 AMU, atomic number 24 and its symbol (Cr). In the Periodic Table, Chromium is located in Group 6, Period 4 and Block (D). Its atom has 24 electrons, 24 protons, 28 neutrons and 4 energy levels. The density of chromium is 7.19 grams per cubic centimeter. Chromium metal is found in the solid state at room temperature, with a melting point of 1907 °C (3465 °F) and a boiling point of 2671 °C (4840 °F).

    Chromium was discovered by Louis-Nicolas Vauquelin in 1797.
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    Properties of Chromium

    • Chromium is a silver-white metal with a slight blue tint.
    • Chromium is a hard and brittle metal.
    • Chromium has very good corrosion resistance.
    • When exposed to air, chromium reacts with the oxygen present in the air, due to which an oxide layer is immediately formed over it. This layer is impermeable to oxygen, this layer protects the chromium from damage by oxygen and the atmosphere.
    • Chromium is a chemically active element, so it is not found in nature in its pure state.
    • Chromium metal can be polished to produce a shiny surface.
    • Chromium metal is a good conductor of electricity and heat.
    • Chromium metal does not react with water.
    • When chromium metal is heated, it forms green colored chromic oxide.
    • Chromium metal dissolves in hydrochloric acid.
    • Chromium metal does not react with nitric acid.
    • Chromium becomes paramagnetic at temperatures above 38 °C.

    Uses of Chromium

    • Chromium metal is used to combine with other metals to form alloys.
    • Chromium is used to harden steel and produce stainless steel.
    • Chromium is used in leather tanning.
    • We need 20 to 35 micrograms of chromium per day, it helps our body use glucose, while it is toxic in excess.
    • Chromium is used for chrome plating, which is used in most vehicles.
    • Chrome-plating can also be done on plastic, mostly used in bathroom fittings.
    • Chromium compounds are used in industry as catalysts and pigments.
    • Chromium alloys are used in making armor, ball-bearings, safes and cutting tools.
    • Chromium compounds are used to anodize aluminium.
    • Chromium oxide is used in the manufacture of magnetic tape.
    • Chromium is used to give green color to glass.

    Interesting facts about Chromium

    • Chromium is the 21st most abundant element on Earth.
    • Chromium is obtained by heating the chromite mineral in the presence of carbon, or chromium-oxide in the presence of aluminum or silicon.
    • The red color of ruby and green color of emerald is due to chromium.
    • Chromium is the only element that exhibits antiferromagnetic ordering in the solid state at and below room temperature.
    • More than 75% of the total chromium produced is used to make stainless steel and other alloys.

    Detailed Information on Some other Metals

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