Question

16) Xenon and krypton are used in electric bulbs to slow down _______ of tungsten.

Answer 1

1) Xenon and krypton are inert gases which belong to group 18 of the periodic table.

2) Xenon and argon have their valence shell completely filled hence they are non-reactive gases.

3) Tungsten is used as a filament in the electric bulbs and it has the property to convert from a solid to a gaseous state at $550°\mathrm{C}$.To slow down this process of sublimation inert gases like krypton and xenon are used which do not react with other chemical species.

So, Xenon and krypton are used in electric bulbs to slow down the sublimation of tungsten