okay boombastic ur right.
There is nothing got to do with it being heavier or abundant. They asked what makes it suitable for filament lamps.
Helium is also abundant if u guys don't know. It is used in weather balloons and in scuba diving(80%helium and 20%oxygen mixture, although oxygen is more abundant) .
The reason why argon is used in filament bulbs is because the metal filament will not burn in Argon and it reduces evaporation of the metal filament.
i know im a bit late for this topic
i was out all day
anyways i wanted to say dat my dad is a chemical engineer and he sed being abundant is da probably da ryt answer
cos it is and dey dnt expect us to know all da properties of argon as opposed to helium
bt they do expect us to knw da composition of air and it contains more argon
and i quoted this to say dat you shud compare da number of weather baloons and scuba diving kits to light bulbs