Argon, like the rest of the noble gases in column 18 in the periodic table, rarely interacts with other elements. To make this crystal, scientists put a sponge-like material between two diamonds and squeezed the diamonds very tightly together. This causes pressure to build up in the crystal. However, the argon needs to be cooled to-196.15 °C/ -321.07 °F, when it becomes a liquid, before it is possible to trap it inside the crystal. The fact that such harsh conditions are necessary to get argon into a crystal tell us that argon really doesn’t like to play with other elements! For this reason, it is often used as a carrier gas, i.e. it transports gases which are very reactive, as we know that argon will not interfere in chemical reactions.
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