Chemistry Discoveries Test 13

1.Who is the only scientist in the world to have won the Nobel Prize in Chemistry twice?

2.In year 1817________ tried to sort the elements with the same properties in groups.

3. __________ was the first person to isolate methane gas. He discovered that methane mixed with air could be exploded with an electric spark.

4.William Crookes was a physical chemist who discovered and named the element __________ .