Cr - Chromium

This transition metal was discovered by Vanquelin in 1790. Modern uses include pigment, high strength alloys and metal finishing applications. We use chromium compounds for crystal growing, redox titrations and spectrophotometric analysis.

Atomic number - 24 Density g/mL 7 .19

Atomic weight u 51 .996 Melting point K 2130

Bonding radius A 1 .18 Boiling point K 2945

Atomic radius A 1 .85 Heat of vaporization kJ/mol 344 .3

Ionization Potential V 6 .766 Heat of fusion kJ/mol 16 .9

Electronegativity - 1 .66 Specific heat J/gK 0 .45

The oxide is a strong acid.
Crystal are body centered cubic.

Electron config. : [Ar] 3d⁵ 4s¹

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Cr: Click mass number for decay process, product for element page.

043
21 msec
EC/ECa/ECp,15.700
V-43/Sc-39/Ti-42
42.997702 044
53 msec
ECp,8.580 MeV
Ti-43
43.985474 045
50 msec
EC/ECp,12.460
V-45/Ti-44
44.979162 046
0.26 sec
EC,7.603 MeV
V-46
45.968361 047
500 msec
EC,7.451 MeV
V-47
46.962905 048
21.56 hr
EC,1.659 MeV
V-48
47.954036 049
42.3 min
EC,2.631 MeV
V-49
48.951341

050 4.345%
1.8E+17 yr
2EC,1.037 MeV
Ti-50
49.946049 051
27.702 da
EC,2.471 MeV
V-51
50.944771 052 83.789%

Stable

51.940511 053 9.501%

Stable

52.940653 054 2.365%

Stable

53.938884 055
3.497 min
B-,2.603 MeV
Mn-55
54.940844 056
5.94 min
B-,1.617 MeV
Mn-56
55.940644

057
21.1 sec
B-,5.090 MeV
Mn-57
56.943757 058
7.0 sec
B-,4.010 MeV
Mn-58
57.944293 059
0.74 sec
B-,7.700 MeV
Mn-59
58.948716 060
0.57 sec
B-,5.900 MeV
Mn-60
59.949758 061
200 nsec
B-,8.800 MeV
Mn-61
60.954052 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

Atomic number	-	24		Density	g/mL	7	.19
Atomic weight	u	51	.996	Melting point	K	2130
Bonding radius	A	1	.18	Boiling point	K	2945
Atomic radius	A	1	.85	Heat of vaporization	kJ/mol	344	.3
Ionization Potential	V	6	.766	Heat of fusion	kJ/mol	16	.9
Electronegativity	-	1	.66	Specific heat	J/gK	0	.45
The oxide is a strong acid.				Crystal are body centered cubic.
Electron config. : [Ar] 3d⁵ 4s¹
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043 21 msec EC/ECa/ECp,15.700 V-43/Sc-39/Ti-42 42.997702	044 53 msec ECp,8.580 MeV Ti-43 43.985474	045 50 msec EC/ECp,12.460 V-45/Ti-44 44.979162	046 0.26 sec EC,7.603 MeV V-46 45.968361	047 500 msec EC,7.451 MeV V-47 46.962905	048 21.56 hr EC,1.659 MeV V-48 47.954036	049 42.3 min EC,2.631 MeV V-49 48.951341
050 4.345% 1.8E+17 yr 2EC,1.037 MeV Ti-50 49.946049	051 27.702 da EC,2.471 MeV V-51 50.944771	052 83.789% Stable 51.940511	053 9.501% Stable 52.940653	054 2.365% Stable 53.938884	055 3.497 min B-,2.603 MeV Mn-55 54.940844	056 5.94 min B-,1.617 MeV Mn-56 55.940644
057 21.1 sec B-,5.090 MeV Mn-57 56.943757	058 7.0 sec B-,4.010 MeV Mn-58 57.944293	059 0.74 sec B-,7.700 MeV Mn-59 58.948716	060 0.57 sec B-,5.900 MeV Mn-60 59.949758	061 200 nsec B-,8.800 MeV Mn-61 60.954052	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass