The plural form of chromium, referring to multiple instances, samples, or types of the chemical element with atomic number 24.
Simple plural of 'chromium' formed by adding '-s'; chromium itself comes from Greek 'chroma' (color) because it forms colorful compounds.
Chromium comes in different oxidation states that produce wildly different colors—chromium III is green while chromium VI is yellow-orange, and the chemistry completely changes how toxic each one is to humans.
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