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what are group 0 elements called?
noble gases
6.14 why are noble gases chemically inert (electronic configurations)
atoms form bonds to become more stable by gaining/ losing/sharing electrons to get electronic configuration like noble gas
full outer shell of electrons = stable electronic configuration - no need to react
6.15 uses of noble gases - depend on inertness
argon: added to space above wine in wine barrels - stops oxygen in air reacting with wine
6.15 uses of noble gases - depend on low density
helium: used in weather balloons & airships - less dense than air so they float
6.15 uses of noble gases - depend on non-flammability
argon: used in filament lamps - stops filament burning away
6.16 helium, neon, argon, krypton - physical properties pattern (melting/boiling points, density)
helium, neon, argon, krypton = increasing melting/boiling points
helium, neon, argon, krypton = increasing density
6.16 noble gases - physical properties pattern
melting/boiling points increase down group - top = lowest, bottom = highest
density increases down group - top = lowest, bottom = highest