The most recently discovered element from this group was formed by collisions between californium and calcium. The first one was discovered by Pierre Janssen and their name was coined by Hugo Erdmann. Another element from this group was discovered by Lord Rayleigh when he noticed a difference between the mass of chemically produced nitrogen and atmospheric nitrogen. Linus Pauling predicted that one of them could form a he
The most recently discovered element from this group was formed by collisions between californium and calcium. The first one was discovered by Pierre Janssen and their name was coined by Hugo Erdmann. Another element from this group was discovered by Lord Rayleigh when he noticed a difference between the mass of chemically produced nitrogen and atmospheric nitrogen. Linus Pauling predicted that one of them could form a hexafluoride compound and their filled p orbital gives them the highest first ionization energies on the periodic table. FTP, identify this group of elements on group 18 of the periodic table that include Radon and Neon. 
The most recently discovered element from this group was formed by collisions between californium and calcium.
{Noble gas} (prompt on inert gas, accept group 18 elements before it is mentioned)