2. • The atomic number is 34
and the atomic mass is
78,96
• In group 16 and period 4
• Non-metal
• Symbol: Se

4. • Melting point is 217oC,
Boiling point is 684.9oC
• Solid at room temperature
• Color: gray
• Density: 4.81 g/cm3

5. • A small amount of selenium
is good for your health!
• Also used as a catalyst in
some chemical reactions
• Manufacturing products
• Treatment to HIV symptoms!

6. • Selenium dioxide
(SeO2) Selenium
trioxide (SeO3)
• Selenium chloride
(Se2Cl2)
• Mercury Selenide
(HgSe)
Lead Selenide (PbSe)
Zinc Selenide (ZnSe)
Copper Indium Gallium
Diselenide

7. • Very important to our health.
• Recent discoveries say that selenium is a
treatment to HIV symptoms
• Essential trace mineral to our body