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Manganese powder

CAS number : 7439-96-5

Molecular weight :

Molecular formula/chemical symbol :Mn

Description :

Manganese is a silvery-gray metal that resembles iron. It is hard and very brittle, difficult to fuse, but easy to oxidize. Manganese metal and its common ions are paramagnetic. Manganese tarnishes slowly in air and "rusts" like iron, in water containing dissolved oxygen.

Naturally occurring manganese is composed of one stable isotope, 55Mn. Eighteen radioisotopes have been characterized, with the most stable being 53Mn with a half-life of 3.7 million years, 54Mn with a half-life of 312.3 days, and 52Mn with a half-life of 5.591 days. All of the remaining radioactive isotopes have half-lives that are less than three hours and the majority of these have half-lives that are less than one minute. This element also has three meta states.

General properties

Name, symbol, number

manganese, Mn, 25

Pronunciation

/?m??ɡ?ni?z/ MANG-g?-neez

Element category

transition metal

Group, period, block

7, 4, d

Standard atomic weight

54.938045(5)

Electron configuration

[Ar] 4s2 3d5
2, 8, 13, 2

History

Discovery

Torbern Olof Bergman (1770)

First isolation

Johann Gottlieb Gahn (1774)

Physical properties

Phase

solid

Density (near r.t.)

7.21 g·cm?3

Liquid density at m.p.

5.95 g·cm?3

Melting point

1519 K2275 °F?1246 °C,?,

Boiling point

3742 °F?2061 °C,?2334 K,

12.91 kJ·mol?1

221 kJ·mol?1

26.32 J·mol?1·K?1

P (Pa)	1	10	100	1 k	10 k	100 k
at T (K)	1228	1347	1493	1691	1955	2333

Atomic properties

Oxidation states

7, 6, 5, 4, 3, 2, 1, -1, -2, -3
(oxides: acidic, basic or amphoteric
depending on the oxidation state)

Electronegativity

1.55 (Pauling scale)

Ionization energies
(more)

1st: 717.3 kJ·mol?1

2nd: 1509.0 kJ·mol?1

3rd: 3248 kJ·mol?1

Atomic radius

127 pm

Covalent radius

139±5 (low spin), 161±8 (high spin) pm

Miscellanea

Crystal structure

body-centered cubic

Magnetic ordering

paramagnetic

Electrical resistivity

(20 °C) 1.44 ?Ω·m

Thermal conductivity

7.81 W·m?1·K?1

Thermal expansion

(25 °C) 21.7 ?m·m?1·K?1

Speed of sound (thin rod)

(20 °C) 5150 m·s?1

198 GPa

120 GPa

6.0

196 MPa

7439-96-5

Most stable isotopes

Main article: Isotopes of manganese

iso	NA	half-life	DM	DE (MeV)	DP
52Mn	syn	5.591 d	ε	-	52Cr
			β+	0.575	52Cr
			γ	0.7, 0.9, 1.4	-
53Mn	trace	3.74×106 y	ε	-	53Cr
54Mn	syn	312.3 d	ε	1.377	54Cr
54Mn	syn	312.3 d	γ	0.834	-
55Mn	100%	55Mn is stable with 30 neutrons

USES :

关键词:Nanometer materials

Report :

Product name	Manganese powder	CAS：7439-96-5
Description	Light gray metal
TEST ITEMS		TEST RESULTS
Mn		≥99.95%
Se		≤0.001%
Si		≤0.004%
S		≤0.02%
C		≤0.01%
P		≤0.002%
Fe		≤0.005%