Helium

12345678
Across
  1. 2. 4.00260 is the _______weight of helium
  2. 5. helium is the second most ________common element in the Universe
  3. 6. symbol for helium
  4. 8. in 1868 Pierre ________discovered helium
Down
  1. 1. Helium is the second lightest element in the universe
  2. 3. atomic number of helium
  3. 4. Helium is classified as a ________gas and nonmetal
  4. 7. phase at room temperature