58 2 · 8 · 18 · 19 · 9 · 2

Cerium, Ce, element 58

Lanthanide· Period 6· f-block

Configuration [Xe]4f15d16s2

Atomic weight
140.116Da
Phase
solid
Density
6.77g/cm³
Melting point
1,072.15K 799 °C
Boiling point
3,716.15K 3,443 °C
Electronegativity
1.12

Silvery metallic element, belongs to the lanthanoids. Four natural isotopes exist, and fifteen radioactive isotopes have been identified. Used in some rare-earth alloys. The oxidized form is used in the glass industry. Discovered by Martin .H. Klaproth in 1803. 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 cerium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
140.116Da
Source: mendeleev
Electron configuration
[Xe]4f15d16s2
Source: mendeleev
Uncertainty of the atomic weight
0.001Da
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d104s24p64d104f15s25p65d16s2
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 18 · 19 · 9 · 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
1s1.151956.8481
2s15.2642.74
2p4.217653.7824
3s19.340838.6592
3p19.040538.9595
3d13.914744.0853
4s28.3229.68
4p29.393628.6064
4d32.339225.6608
4f56.3241.676
5s39.086518.9135
5p41.034516.9655
6s47.203610.7964