Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Where does hydrogen occur in a free state?

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> In the free state, hydrogen is found in traces in the earth's crust and atmosphere. Volcanic gases contain 0.025%, the earth's crust 0.98%, the earth's atmosphere 0.01% and the atmosphere of the sun and stars 1.1%.