Researchers have dated volcanic layers at six fossil-bearing sites in Turkey, including one known as Taşhan (shown). The ...
In 1869, Mendeleev's first periodic table did not include them, as closed-shell elements remained undiscovered until Lord Rayleigh and William Ramsey isolated argon in 1894. Remarkably ...
Argon, krypton and xenon are very unreactive. They replace the air inside the lamp, preventing the metal wire from burning away.
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