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Lithium is the element that produces a red flame when it reacts with water.
No, neon gas in a neon sign is not a compound. Neon gas is an element, a noble gas with the chemical symbol Ne and atomic number 10. It is used in neon signs because it emits a bright red-orange light when electricity passes through it.
You think probably to neon (red light); but other gases can be used.
When lithium is added to water, it produces a red flame. This is due to the release of energy as the lithium reacts with the water to form lithium hydroxide and hydrogen gas.
The most common container in practice is a gas-discharge lighting unit that has a red light color. The most common natural source is the natural atmosphere, which contains neon in small amounts.