Helium

Definitions

1. The second-lightest chemical element (symbol He), with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.
   uncountable
2. A form or sample of the element.
   countable

Equivalents

Examples

“It was an enormous balloon filled with helium, that elemental gas forged from hydrogen in the nuclear furnace of the stars.”

CEFR level