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Definitions:

Selenium

A non-metallic chemical element with properties similar to sulfur and tellurium, used in electronic components and as a dietary supplement.

Elemental Symbol

A notation of one or two letters representing a chemical element, often derived from its English name or Latin origin.

Tungsten

A hard, rare metal under standard conditions, with the highest melting point of all the elements, used in light bulb filaments and steel alloys.

Elemental Symbol

A one or two-letter abbreviation used to represent an element on the periodic table.

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