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Name origin and discovery
It was discovered in 1797 by Louis-Nicholas Vauquelin. The element was named chromium by Nicholas Vauquelin.

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Atomic Structure
1) Atomic number Z = 24
2) Mass number A = 52
3)Atomic Mass A =51.9961u
4) List of isotopes:
1) Cr - 42
2) Cr - 43
3) Cr - 44
4) Cr - 45
5) Cr - 46
6) Cr - 47
7) Cr - 48
8) Cr - 49
9) Cr - 50
10) Cr - 51
11) Cr - 52
12) Cr - 53
13) Cr - 54
14) Cr - 55
15) Cr - 56
16) Cr - 57
17) Cr - 58
18) Cr - 59
19) Cr - 60
20) Cr - 61
21) Cr - 62
22) Cr - 63
23) Cr - 64
24) Cr - 65
25) Cr - 66
26) Cr - 67
27) Cr - 68

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Properties
Physical:
1) Physical State: solid
2) Color: grey
3) Odor: odorless
4) Density: 7.15 [g/cm ³]
Chemical:
1) it combines with oxygen at room temperature to form chromium oxide
2) metallic chromium dissolves in dilute hydrochloric acid forming Cr(II) and hydrogen gas, H₂

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Uses:
1) It is used to harden steel.

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Uses:
2) It is used to give a chromium plating on metal objects.