10. Neon
Name: Neon
Symbol: Ne
Atomic Number: 10
Atomic Mass: 20.1797 amu
Melting Point: -248.6 °C (24.549994 °K, -415.48 °F)
Boiling Point: -246.1 °C (27.049994 °K, -410.98 °F)
Number of Protons/Electrons: 10
Number of Neutrons: 10
Classification: Noble Gas
Crystal Structure: Cubic
Density(293 K): 0.901 g/cm3
Color: colorless
It is a very inert element. Neon forms an unstable hydrate. In a vacuum discharge tube, neon glows reddish orange. Of all the rare gases, the discharge of neon is the most intense at ordinary voltages and currents. It is present in the atmosphere as 1 part in 65000. Liquid neon has over 40 times more refrigerating capacity than liquid helium, and more than 3 times that of liquid hydrogen.
Neon (Greek neos meaning "new") was discovered by William Ramsay and Morris Travers in 1898.
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