Helium

Helium (from Greek: ἥλιος, romanized: Helios, lit. 'Sun') is a chemical element with the symbol He and atomic number 2. It is a colourless, odourless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Helium is the second least reactive noble gas after neon, and thus the second least reactive of all elements. It is also widely known for its effect on a person's voice, it changes the tinder and not the pitch. The effect is very similar to Hydrogen when inhaled, and you can try it yourselves! - just don't inhale too much and be in an environment where fire or electricity is involved.