Which alkali metal produces a bright yellow flame?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — alkali metal Modern version of the periodic table of the elements (printable).

The alkali metal that produces a bright yellow flame is sodium.12

When subjected to a flame, sodium emits light characterized by two prominent lines in the yellow portion of the spectrum, a property that serves as the basis for a standard analytical test to identify the presence of the element.13