Flame Colours and Spectroscopy

The video explores the evolution of spectroscopy, starting with Bunsen's flame tests and advancing to Kirchhoff's spectroscope, which allowed for precise element identification. This led to the discovery of cesium and rubidium. The video also covers the discovery of helium during a solar eclipse by Jansen and Lockyer, highlighting the power of spectroscopy in identifying new elements.

What was the initial method used to identify elements before the use of a prism?

• Measuring atomic weight

• Observing flame colors

• Counting protons

• Using a microscope

What device did Kirchhoff and Bunsen use to discover new elements?

• Thermometer

• Spectroscope

• Telescope

• Microscope

Which two elements were discovered by Bunsen and Kirchhoff using spectroscopy?

• Carbon and Nitrogen

• Oxygen and Hydrogen

• Cesium and Rubidium

• Helium and Neon

During which event was helium first observed?

• A meteor shower

• A comet passing

• A lunar eclipse

• A solar eclipse

Who named the element helium after observing it during a solar eclipse?

• Gustav Kirchhoff

• Robert Bunsen

• Pierre Jansen

• Norman Lockyer