This halogen's elemental form is necessary for combustion and is produced upon electrolysis of water.
This element is used in the final step of converting iron into steel, and this element is the most common in the Earth's crust. This halogen's elemental form is necessary for combustion and is produced upon electrolysis of water. Approximately 21% of the Earth's atmosphere is comprised of it gaseous diatomic form, but this element also has a triatomic form called ozone. For 10 points, name the element with atomic number 8 and chemical symbol O.
This element is used in the final step of converting iron into steel, and this element is the most common in the Earth's crust.
{Oxygen}