Yet the two elements last discovered, argon and helium, do not seem to present any relation with the periodic system. The physical properties of argon are very distinct; its characteristic.

A CERN experiment has revealed that up quarks outnumber down quarks after certain collisions, defying predictions. This ...

THE discovery of krypton and neon was announced ... that we had obtained a gas with a spectrum differing from that of argon and yet of approximately the same density; to this gas we gave the ...