Advancements in which of the following pieces of technology allowed scientists to make new discoveries about materials on an atomic level?

telescope

Explanation:

The glowing splint test is a test for an oxidising gas, such as oxygen. In this test, a splint is lit, allowed to burn for a few seconds, then blown out by mouth or by shaking. Whilst the ember at the tip is still glowing hot, the splint is introduced to the gas sample that has been trapped in a vessel.