Chemistry

What post-transition metal is used to make blue and violet light-emitting diodes (LEDs) and diode lasers?

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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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What heat is released during a change of state?
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What two solvents could be used in a successful extraction?
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Who is generally credited with discovering the electron?
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What chemical substance is abbreviated CO2?
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What will usually happen to matter that is cooled?
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What mineral has the chemical formula PbS?
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What symbol appears on the periodic table for Unniloctium which has the atomic number 108?
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