helium: a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
excellency: a title used to address dignitaries (such as ambassadors or governors); usually preceded by `Your' or `His' or `Her'