Manganese 25

Atomic No. Order:

Alphabetic Order:

Periodic Table

2, 8,

13, 2

Mn
25

Tc
43

Re
75

Bh
107

Ups
157

Bns
207

Manganese

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

54.938 049 (±9) [Since 1995]

Atomic Radius pm

124

First Ionisation Energy
kJ mol ^-1

717.4

Ionisation Energy (eV)

7.4340

Electronegativity

1.55

Density
kg m ^-3

7440 [±, 293 K]
6430 [l., m.p.]

Molar Volume cm ³

7.38

Thermal Conductivity
W m ^-1 K ^-1

7.82 [300 K]

Melting Point K

1517

Boiling Point K

2235

Number of Isotopes

Isotope Atomic mass/u Mole fraction

55Mn 54.938 0493(15) 1.0000

Inner + outer Shells

Inner + outer Orbitals

Filling Orbital

3d ⁵

Ground State Electron
Configuration

[Ar]

3d ⁵

4s ²

Ground State Electron
Configuration with
free Orbitals (n= 11)

0, 0, 5, 6

Ground State Electron
Configuration with
compressed Orbitals (n= 24 )

0, 0, 0, 24

Singularity

	s	p	d		f	g	h	i	j
1	2
2	2	6
3	2	6	5	5
4	2	6	10		14
5
6
7

Term Symbol

⁶S _5/2

Discovery

It was discovered by the Swedish pharmacist and chemist Carl-Wilhelm Scheele in 1774. In 1774, the Swedish chemist Johan Gottlieb Gahn (Stockholm, Sweden) first isolated the metal.

Name Derived From

The name derives from the Latin magnes for "magnet" since pyrolusite (MnO ₂) has magnetic properties.

APSIDIUM ©	Created:	2002- 06-01	025.pdf
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