Topic Details (Notes format)

Which element has the chemical symbol "Er"?

Which element has the chemical symbol "Pa"?

What is the phenomenon called when water vapor changes directly from gas to solid, forming frost?

Who discovered Supernova SN 1987A?

Which device converts chemical energy to electrical energy?

Who discovered technetium?

Who discovered the Mask of Agamemnon?

Who was known as the ‘Maid of Orléans’?

Which is the largest freshwater lake by volume in North America?

Who discovered apoptosis?