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https://messer.co.th/wp-content/uploads/2025/10/Rare-Gases-7-1.png500500Argon (Ar) https://messer.co.th/wp-content/uploads/2025/10/50.mp4 Argon is an atom, with the symbol Ar and atomic number 18 and atomic mass 39,948. It was discovered in the 19th century by Sir Rayleigh and Sir William Ramsay. It is a colorless, odorless, non-combustible and non-toxic noble gas. It is heavier than air. Air contains a concentration of approximately 0.93% […]