7 - Nitrogen - Colorless nitrogen gas makes up of the atmosphere, but here we see it in liquid form at It is boiling off, creating a visible vapor--not of steam, but of water condensed from the surrounding air.
54 Xenon -Xe- The xenon gas in this tube is being excited by a high voltage discharge, creating a lovely pale violet glow. Xenon-filled tubes driven by high voltage capacitors are the basis for modern photographic flashes.
Neon signs really are made with neon, like this Ne-shaped tube filled with this inert gas. A high voltage transformer sends an electric current through the tube, creating a characteristic bright neon-red arc.
52 Tellurium -Te-Tellurium is hardly ever used in pure form, but these beautiful slender crystals are how it is distributed. Research is hindered by the fact that if you absorb even tiny amounts, you smell of garlic for months.