Hydrogen--nonmetal

123456789101112
Across
  1. 2. hydrdogen is one of the most________elements
  2. 5. most common source of hydrogen
  3. 8. percentage of all matter by mass in the universe that is hydrogen
  4. 10. hydrogen gas is ______in Earth's atmosphere because the atoms are light and escape gravity floating into space
  5. 11. hydrogen takes this place as the most abundant on Earth
  6. 12. hydrogen is the element from which all other elements are formed and a process start is in these
Down
  1. 1. hydrogen is in this position on the periodic table
  2. 3. the number of protons that give hydrogen the number one on the periodic table
  3. 4. percentage of all atoms in the universe that are hydrogen
  4. 6. another source of hydrogen besides hydrocarbons in fossil fuels
  5. 7. hydrogen's comparative weight compared with all the chemical elements
  6. 9. the type of element that hydrogen is