66 2 · 8 · 18 · 28 · 8 · 2

Dysprosium, Dy, element 66

Lanthanide· Period 6· f-block

Configuration [Xe]4f¹⁰6s²

Atomic weight: 162.5Da
Phase: solid
Density: 8.55g/cm³
Melting point: 1,685.15K 1,412 °C
Boiling point: 2,840.15K 2,567 °C
Electronegativity: 1.22

Metallic with a bright silvery-white lustre. Dysprosium belongs to the lanthanoids. It is relatively stable in air at room temperatures, it will however dissolve in mineral acids, evolving hydrogen. It is found in from rare-earth minerals. There are seven natural isotopes of dysprosium, and eight radioisotopes, Dy-154 being the most stable with a half-life of 3*10^6 years. Dysprosium is used as a neutron absorber in nuclear fission reactions, and in compact disks. It was discovered by Paul Emile Lecoq de Boisbaudran in 1886 in France. Its name comes from the Greek word dysprositos, which means hard to obtain. 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 dysprosium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.: 162.5Da; Source: mendeleev
Electron configuration: [Xe]4f¹⁰6s²; 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.: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁰5s²5p⁶6s²; Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.: 2 · 8 · 18 · 28 · 8 · 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.

Subshell	Screening σ	Effective charge Z − σ
1s	1.2914	64.7086
2s	17.2906	48.7094
2p	4.3204	61.6796
3s	20.6067	45.3933
3p	20.1195	45.8805
3d	13.6701	52.3299
4s	31.408	34.592
4p	32.174	33.826
4d	34.982	31.018
4f	39.464	26.536
5s	46.696	19.304
5p	48.873	17.127
6s	57.6564	8.3436