WK3 - Noble Gases

• Colitarelates the stability of noble gases to their electron configuration.
• Physical properties of noble gases include being colourless, odourless, unreactive, and difficult to isolate and identify.
• Uses of noble gases include being used as a filling gas in balloons, as a coolant, and in the production of electricity.
• Discovery and electron structure of noble gases was first done by William Ramsey, Lord Rayleigh, and Morris Travers in the 1890s.
• Boiling points of Kr, Xe, and Rn can be predicted.
• Noble gases are unreactive, with few chemical patterns or trends among the group.
• Trend is a gradual change in a property or characteristic of elements in the same group of the periodic table.
• Density is a measure of mass in a given volume, often expressed in g/dm^3.
• Noble gas is an element belonging to group 0 of the periodic table.
• Monoatomic refers to an element that exists as a single atom.
• Inert describes a substance that is unreactive under normal conditions.
• Discovery of argon, a noble gas, was done by Ramsay and his colleagues.
• Noble gases were first discovered, but not recognized, by Henry Cavendish in 1766.
• Ramsay identified helium, neon, krypton, and xenon after studying liquid air in 1885 and 1888.
• Radon, another noble gas, was discovered in 1900.
• All noble gases have full outer electron shells and do not need to gain, lose or share electrons.
• Noble gases are very stable and the most unreactive (or inert) of all the elements.
• Noble gases exist as individual atoms, most other gases are diatomic.
• In the rest of the periodic table, the number of the group is the same as the number of outer shell electrons in the elements of that group, but this is not true for the noble gases.
• Helium only has 2 electrons in its outer shell, while the others all have 8.
• The group’s number was changed to 0 because of this.
• All noble gases are colourless, odourless, unreactive, and difficult to isolate and identify.
• Many uses of noble gases depend on their ability to prevent other, undesirable, reactions taking place
• Neon is used in neon lights.
• Xenon is used in lamps for photography and cinematography.
• Argon is used in welding torches and fluorescent lamps.
• Krypton is used in lasers and HID headlights.
• Argon is used in light bulbs to stop them from burning out too quickly.
• Hydrogen (H) is the first element in Group 1A.
• Radon is used in cancer treatment.