CHEMISTRY ONLINE TEST 17

lone pairs occupy equatorial positions → linear shape.

Argon prevents oxidation of tungsten filament.

4 bond pairs + 2 lone pairs → octahedral electron geometry → square planar shape.

Neil Bartlett prepared XeF₂, proving noble gases can form compounds.

Xe has comparatively lower ionization energy → forms fluorides and oxides.

Boiling point increases down the group due to increased van der Waals forces.

Helium is light, non-toxic, and prevents nitrogen narcosis.

Smallest size and highest effective nuclear charge → maximum ionization energy.

Stable ns² np⁶ configuration (He: 1s²) makes them inert.

RnO is a compound of radon. Noble gases are monoatomic elements