Selenium

Located at Group 16 and Period 4 of the Periodic Table is the element found in the Anti - Dandruff Shampoo. This is Selenium.

Jons Jacob Berzelius

Johan Gottlieb Gahn

First discovered by Jons Jacob Berzelius, a Swedish chemist and Johan Gottlieb Gahn, another Swedish chemist at 1817 and first isolated also by Jons Jacob Berzelius and Johan Gottlieb Gahn in 1817.

Selenium exists in three forms, red, gray and black. Selenium is the element we need in just the right amount in order to keep our bodies healthy.

Black Selenium                        Red Selenium

However, although Selenium is is good for our bodies, its compound can be very toxic. But, Selenium's compounds are mainly used for good purposes, such as shampoos, face washers and more. So, Selenium is considered to be good to us.

Atomic Number : 34 
Name: Selenium
Latin name: Selenium 
Electrons per shell : [ 2, 8, 18, 6 ]
Discoverer : Jöns Jacob Berzelius and Johan Gottlieb Gahn
Isolator : Jöns Jacob Berzelius and Johan Gottlieb Gahn
Element's : Atomic mass : 78.96 u
                  : Density : 4.14 g/cm3 
                  : Type : Other non-metal
Chemical properties :

• Combines easily with hydrogen
• Combines easily with Fluorine
• Combines easily with Chlorine
• Combines easily with Bromine 
• It burns in oxygen with a bright blue flame to form selenium dioxide
• Combines with a number of metals to form compounds called selenides
• 39 isotopes : 3 of them are :
     Selenium - 77 : Protons : 34
                            : Neutrons : 43
                            : Electrons : 34

  

  Selenium - 79

  
     ( Half Life : Stable )
  
     Selenium - 78 : Protons : 34
                            : Neutrons : 44
                            : Electrons : 34
     ( Half Life : Stable )
  
     Selenium - 79 : Protons : 34
                            : Neutrons : 45
                            : Electrons : 34
     ( Half Life : 327000 years )

Physical Properties : 

• Bluish Metallic 
• Hard
• Shiny
• Melting point : 220 degrees Celsius ( 428 Fahrenheit )
• Boiling point : 684.8 degrees Celsius ( 1264.64 Fahrenheit )

How Selenium got its name?

It was Berzelius who discovered selenium in 1817, as an impurity in sulfuric acid. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon.

Moon

 Uses

Selenium is used as Glass making, Electronics and used to make alloys. Selenium is also made into compounds for Anti - Dandruff Shampoos and Face Washes.

Shampoos

THIS IS THE END OF SELENIUM

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