RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Neon gas in a discharge tube emitting red light as a current is passed through it. The current causes the ionisation of the gas, which emits light at specific characteristic wavelengths, the combination of which appears red. Different gases produce different colours, each characteristic and indicative of their electron configuration.
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