Why only nitrogen and argon gas are used in bulb

In bulbs 93 percent Argon and 7 percent Nitrogen is filled because both these are generally heavy gases so they reduce transfer of heat between panels in bulb
also both are colourless and dry gases

Only nitrogen and argon is used in bulbs because these gases get heat up very fast and they are easily available in large quantity in nature to us in sufficient cost. HOPING THAT THIS WILL HELP YOU!!!

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Oxygen= 88ghydrogen= 12g