Chromium (Cr)
Makes things shiny, like car bumpers and taps.
Chromium facts
- Symbol
- Cr
- Atomic number
- 24
- Atomic mass
- 51.996
- Family
- Transition metals
- Period
- 4
- Group
- 6
What does chromium react with?
Chromium makes a new substance with 11 other elements and chemicals in our lab:
- Chromium + BoronChromium boride Cr + 2B → CrB₂ · Only in a very hot furnace · Try it
- Chromium + CarbonChromium carbide 3Cr + 2C → Cr₃C₂ · Only in a very hot furnace · Try it
- Chromium + NitrogenChromium nitride 2Cr + N₂ → 2CrN · Only when heated very strongly · Try it
- Chromium + OxygenChromium(III) oxide 4Cr + 3O₂ → 2Cr₂O₃ · When heated · Try it
- Chromium + FluorineChromium(III) fluoride 2Cr + 3F₂ → 2CrF₃ · At room temperature · Try it
- Chromium + SiliconChromium silicide Cr + 2Si → CrSi₂ · Only in a very hot furnace · Try it
- Chromium + SulfurChromium(III) sulfide 2Cr + 3S → Cr₂S₃ · When heated · Try it
- Chromium + ChlorineChromium(III) chloride 2Cr + 3Cl₂ → 2CrCl₃ · When heated · Try it
- Chromium + BromineChromium(III) bromide 2Cr + 3Br₂ → 2CrBr₃ · When heated · Try it
- Chromium + IodineChromium(III) iodide 2Cr + 3I₂ → 2CrI₃ · When heated · Try it
- Chromium + Hydrochloric AcidChromium(II) chloride + hydrogen gas Cr + 2HCl → CrCl₂ + H₂ · At room temperature · Try it
It also blends into a mixture, like an alloy, with 73 other metals when melted together.
Nothing happens when it's simply mixed with 14 of the others. 21 pairings have never been tried, because not enough atoms have ever existed.