Struktur atom saka thulium lan Actinium
Konfigurasi elektron
[Xe] 4F 13 6s 2
[Rn] 6D 1 7s 2
Struktur Crystal
Hexagonal Tutup dikempalken (HCP)
Face tengah kubik (FCC)
Crystal pola
HCP-Crystal-Structure-of-Thulium.jpg#100
FCC-Crystal-Structure-of-Actinium.jpg#100
pola Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2