|London—William Ramsay, Morris Travers elements|
The hidden one didn’t mingle but William Ramsay and Morris Travers teased it out of liquid air.
Atomic number 36
Six stable isotopes produce yellow, green, a blur of white for flash photography With xenon krypton fills incandescent light bulbs to reduce evaporation of filaments Instead of neon in neon lights stained blue, green, yellow, orange, red, and pink.
Sounds mysterious, secretive, encrypted threatening sci-fi horror. Krypton-85 in the atmosphere signifies secret nuclear weapon research or production.