This sentiment was echoed by Morris Travers, with whom Ramsay co-discovered the four noble gases—neon, argon, krypton, and ...

Remarkably, Ramsey then went on to isolate helium (1895) and radon (1908) and, with Morris Travers, to discover krypton, neon and xenon (1898). It was debated whether the 'inert' monoatomic gases ...