Element 24
Chromium
Transition metals
Chromium (Cr) is in the d-block of the periodic table — group 6, period 4.
Chromium is a chemical element with symbol Cr and atomic number 24.
Key data
- Atomic number
- 24
- Atomic mass
- 51.996 u
- Group / Period
- 6 / 4
- Block
- d-block
- Phase at STP
- Solid
- Density
- 7.19 g/cm³
- Melting point
- 1906.8 °C
- Boiling point
- 2670.8 °C
- Electron configuration
- [Ar] 3d5 4s1
Periodic table block
Chromium is in the d-block (group 6, period 4). Elements land in the d-block when their highest-energy electrons fill a d subshell — these are the transition metals in the middle of the table.
New to this? Periodic table blocks explained: s, p, d, and f
Common uses
- •Stainless steel
- •Chrome plating
- •Green paint pigment
Discovery
Year: 1797
Discovered by: Louis Nicolas Vauquelin
Frequently asked questions
What is the atomic number of Chromium?
Chromium has atomic number 24. Its symbol is Cr and its atomic mass is 51.996 u.
What category of element is Chromium?
Chromium is classified as transition metals. It sits in group 6, period 4 of the periodic table.
What block of the periodic table is Chromium in?
Chromium is in the d-block (group 6, period 4). Its highest-energy electrons occupy the d subshell — you can see this in its electron configuration, [Ar] 3d5 4s1.
What is Chromium used for?
Common uses of Chromium include: Stainless steel, Chrome plating, Green paint pigment.
When was Chromium discovered?
Chromium was discovered in 1797 by Louis Nicolas Vauquelin.
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