Elektrický výboj v intertních plynech, He = helium, Ne = neon, Ar = argon, Kr = kryptorn, Xe = xenon (BAlchemist-hp www.pse-mendelejew.de, Own work, CC BY-SA 2.0 de, https://creativecommons.org/licenses/by-sa/2.0/de/deed.en, via Wikimedia Commons).

Elektrický výboj v intertních plynech, He = helium, Ne = neon, Ar = argon, Kr = kryptorn, Xe = xenon (BAlchemist-hp www.pse-mendelejew.de, Own work, CC BY-SA 2.0 de, https://creativecommons.org/licenses/by-sa/2.0/de/deed.en, via Wikimedia Commons).