Mn - Manganese

A transition metal. The metal discovered in 1770 by Ignatius Kaim, investigated by Bergman and Scheele and finally isolated by swedish mineralist Johann Gottlieb Gahn. The permanganate ion is used in several of our laboratory exercises.

Atomic number - 25 Density g/mL 7 .43

Atomic weight u 54 .938 Melting point K 1517

Bonding radius A 1 .17 Boiling point K 2335

Atomic radius A 1 .79 Heat of vaporization kJ/mol 226

Ionization Potential V 7 .435 Heat of fusion kJ/mol 12 .05

Electronegativity - 1 .55 Specific heat J/gK 0 .48

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

Electron config. : [Ar] 3d⁵ 4s²

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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 Mn: Click mass number for decay process, product for element page.

046
41 msec
EC/ECp,7.603
Cr-46/V-45
45.986720 047
200 nsec
ECp,7.520 MeV
V-46
46.976102 048
158.1 msec
EC/ECa/ECp,13.530
Cr-48/Ti-44/V-47
47.968555 049
382 msec
EC,7.715 MeV
Cr-49
48.959622 050
283.88 msec
EC,7.633 MeV
Cr-50
49.954243 050a
1.75 min
EC,7.862 MeV
Cr-50
49.954489 051
46.2 min
EC,3.208 MeV
Cr-51
50.948215

052
5.591 da
EC,4.712 MeV
Cr-52
51.945569 052a
21.1 min
EC,5.090 MeV
Cr-52
51.945975 053
3.74E+6 yr
EC,3.436 MeV
Cr-53
52.941294 054
312.3 da
B-/EC,1.377
Fe-54/Cr-54
53.940363 055 100%

Stable

54.938049 056
2.5785 hr
B-,3.695 MeV
Fe-56
55.938909 057
85.4 sec
B-,2.691 MeV
Fe-57
56.938287

058
3.0 sec
B-,6.250 MeV
Fe-58
57.939988 059
4.6 sec
B-,5.190 MeV
Fe-59
58.940450 060
51 sec
B-,8.630 MeV
Fe-60
59.943349 061
0.71 sec
B-,7.350 MeV
Fe-61
60.944637 062
0.88 sec
B-,10.400 MeV
Fe-62
61.947933 063
0.25 sec
B-,8.800 MeV
Fe-63
62.949758 065
200 nsec
B-,10.400 MeV
Fe-65
64.956092

MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 12/3/98. This is not a publication of Phoenix College.

Atomic number	-	25		Density	g/mL	7	.43
Atomic weight	u	54	.938	Melting point	K	1517
Bonding radius	A	1	.17	Boiling point	K	2335
Atomic radius	A	1	.79	Heat of vaporization	kJ/mol	226
Ionization Potential	V	7	.435	Heat of fusion	kJ/mol	12	.05
Electronegativity	-	1	.55	Specific heat	J/gK	0	.48
The oxide is a strong acid.				Crystal are body centered cubic.
Electron config. : [Ar] 3d⁵ 4s²
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046 41 msec EC/ECp,7.603 Cr-46/V-45 45.986720	047 200 nsec ECp,7.520 MeV V-46 46.976102	048 158.1 msec EC/ECa/ECp,13.530 Cr-48/Ti-44/V-47 47.968555	049 382 msec EC,7.715 MeV Cr-49 48.959622	050 283.88 msec EC,7.633 MeV Cr-50 49.954243	050a 1.75 min EC,7.862 MeV Cr-50 49.954489	051 46.2 min EC,3.208 MeV Cr-51 50.948215
052 5.591 da EC,4.712 MeV Cr-52 51.945569	052a 21.1 min EC,5.090 MeV Cr-52 51.945975	053 3.74E+6 yr EC,3.436 MeV Cr-53 52.941294	054 312.3 da B-/EC,1.377 Fe-54/Cr-54 53.940363	055 100% Stable 54.938049	056 2.5785 hr B-,3.695 MeV Fe-56 55.938909	057 85.4 sec B-,2.691 MeV Fe-57 56.938287
058 3.0 sec B-,6.250 MeV Fe-58 57.939988	059 4.6 sec B-,5.190 MeV Fe-59 58.940450	060 51 sec B-,8.630 MeV Fe-60 59.943349	061 0.71 sec B-,7.350 MeV Fe-61 60.944637	062 0.88 sec B-,10.400 MeV Fe-62 61.947933	063 0.25 sec B-,8.800 MeV Fe-63 62.949758	065 200 nsec B-,10.400 MeV Fe-65 64.956092
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass