Helium has one more proton than hydrogen
a particle of hellium is small enough to fit in between the molecules of latex (or whatever the balloon is made of) and eventually leaks out due to diffusion. If the environment the balloon is in has the same amount of hellium in it as the balloon, it won't deflate.
one
Hydrodgen and Oxygen.
hellium
4
Hellium
No. Helium does not burn.
There is no element called "hellium". It seems like you might be referring to helium, which has an atomic number of 2.
hellium is a gas that makes light objects float e.g. balloons
In the Earth atmosphere hydrogen exist only as traces: 0,000055 %.
O+H2o+N (oxygen+Hydrodgen 2oxygens+Nitrogen)
Hellium