Krypton

= = = = =Element symbol: Kr= = = = Period: 4 = = = = Group: 18 = = = = Discovered by: Sir William Ramsay ( a Scottish chemist) = = = = Discovered in: 1898 = = = = State at room temperature: Gas = = = = Colour: Colourless = = = = Atomic number: 36 = = = = Atomic mass: 83.798 = = = = Amount of protons: 36 protons = = = = Amount of neutrons: 48 neutrons = = = = Amount of electrons: 36 electrons = = = = Melting point: -157.2 °c = = = = Boiling Point: -152.3°c = = = = Type: non-metal = == = Uses: = = Photography flashes, fluorescent lights, Luminous signs and electric lamp bulbs =