066Lanthanide · Group 3 · Period 6

Dysprosium

Dysprosium (Dy) is element 66, a lanthanide in the f-block — group 3, period 6. It is a solid at room temperature with 6 electron shells (2, 8, 18, 28, 8, 2) and an atomic mass of 162.5001 u.

Atomic mass: 162.5 u
Phase · STP: solid
Melting: 1680 K · 1407 °C
Boiling: 2840 K · 2567 °C
Electronegativity: 1.22
Density: 8.54 g/cm³

Photograph — Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/dysprosium.php

Identity

Atomic number: 66
Standard atomic weight: 162.5 u
Category: Lanthanide
Group: 3
Period: 6
Block: f-block
Oxidation states: +3

Physical properties

Melting point: 1680 K · 1407 °C
Boiling point: 2840 K · 2567 °C
Density: 8.54 g/cm³
Molar heat capacity: 27.7 J/(mol·K)
Atomic radius: 229 pm
Electron affinity: 33.96 kJ/mol

Atomic structure

66protons

97neutrons

66electrons

2valence e⁻

Noble-gas notation: [Xe] 4f10 6s2
Full configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f10
Electrons per shell: 2, 8, 18, 28, 8, 2

Periodic trends

Where Dysprosium ranks across all 118 elements.

Electronegativity1.22

Ionization energy573 kJ/mol

Electron affinity33.96 kJ/mol

Density8.54 g/cm³

Atomic radius229 pm

Ionization energies

Energy to remove each successive electron (kJ/mol).

573

1.1k

2.2k

4.0k

Successive ionization energies (kJ/mol, log scale).

Discovery

Discovered: 1886
Discovered by: Lecoq de Boisbaudran
Named by: —
Appearance: silvery white