chemistry - groups in the periodic table: group 0 (6.14 - 6.16)

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