Helium

Helium

 * Elements name:** Helium


 * Elements symbol:** HE
 * Group number and period on periodic table on the periodic table: group number**:8 **,** **period numbeI:1**
 * who discovered it: ** it was discovered by french astronomer [|Jules Janssen] during a total [|solar eclipse] in [|Guntur], [|India] on August 18, 1868.


 * State at room tempreture:** gas


 * colour:** colourless


 * Atomic number:** 2


 * Atomic mass:** 4.02602 (2)

atomic details particals: number protrons 2 newtons 2 electrons 2


 * melting and boiling point:** Melting -272.0 °C:Boiling -268.6 °C

Helium is an nonmetal


 * 5 facts on helium:**
 * 1:** helium will make your voice change and sound like a chipmunk
 * 2:**it is formed underground


 * 3:**it never freezes


 * 4:**its lighter than air


 * 5:** its lighter than air so if you fill a ballon with it the ballon will float