25 2 · 8 · 13 · 2

Manganese, Mn, element 25

Transition metal· Period 4· Group 7· d-block

Configuration [Ar]3d54s2

Atomic weight
54.938Da
Phase
solid
Density
7.3g/cm³
Melting point
1,519.15K 1,246 °C
Boiling point
2,334.15K 2,061 °C
Electronegativity
1.55

Grey brittle metallic transition element. Rather electropositive, combines with some non-metals when heated. Discovered in 1774 by Scheele. Description from mendeleev.

Back to the table
The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

5 of 5 fields have a value for manganese

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
54.93804Da
Source: mendeleev
Electron configuration
[Ar]3d54s2
Source: mendeleev
Uncertainty of the atomic weight
3×10−6Da
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d54s2
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 13 · 2
Source: Worked outfrom electron configuration

Screening of each subshell

Clementi's screening constants: how much of the nucleus's charge the other electrons hide from an electron in each subshell. What is left is the effective nuclear charge it feels.

SubshellScreening σEffective charge Z − σ
1s0.604324.3957
2s7.206217.7938
2p3.91621.084
3s11.982113.0179
3p12.890812.1092
3d14.471810.5282
4s19.71685.2832