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Lanthanide: Elements 57-70 are called lanthanides. Electrons added during the Aufbau construction of lanthanide atoms go into the 4f subshell.

Lanthanide Contraction: An effect that causes sixth period elements with filled 4f subshells to be smaller than otherwise expected. The intervention of the lanthanides increases the effective nuclear charge, which . . . View Full Definition

Samarium (Sm): Atomic number: 62 Atomic mass: 150.35 g.mol -1 Electronegativity: 1.2 Density: 6.9 g.cm-3 at 20°C Melting point: 1072 °C Boiling point: 1790 °C Vanderwaals radius: unknown Ionic radius: unkn . . . View Full Definition

Terbium (Tb): Atomic number: 65, Atomic mass: 158.92534 g.mol -1, Electronegativity: 1.2, Density: 8.3 g.cm-3 at 20°C, Melting point: 1360 °C, Boiling point: 3041 °C, Vanderwaals radius: unknown, Ionic ra . . . View Full Definition

Thulium (Tm): Atomic number: 69, Atomic mass: 168.93 g.mol -1, Electronegativity: 1.2, Density: 9.3 g.cm-3 at 20°C, Melting point: 1545 °C, Boiling point: 1947 °C, Vanderwaals radius: unknown, Ionic radiu . . . View Full Definition

Rare Earth Element: A metallic element that belongs to Group 3B or to the lanthanide series.

Praseodymium (Pr): Atomic number: 59 , Atomic mass: 140.91 g.mol -1, Electronegativity: 1.1, Density: 6.8 g.cm-3 at 20°C, Melting point: 931 °C, Boiling point: 3512 °C, Vanderwaals radius: unknown, Ionic radiu . . . View Full Definition

Lutetium (Lu): Atomic number: 71, Atomic mass: 174.97 g.mol -1, Electronegativity: 1.2, Density: 9.7 g.cm-3 at 20°C, Melting point: 1663 °C, Boiling point: 3395 °C, Vanderwaals radius: unknown, Ionic radiu . . . View Full Definition

Cerium (Ce): Atomic number: 58, Atomic mass: 140.12 g.mol -1, Electronegativity: 1.1, Density: 6.76 g.cm-3 at 20°C, Melting point: 799 °C, Boiling point: 3426 °C, Vanderwaals radius: 0.181 nm, Ionic radi . . . View Full Definition

Dysprosium (Dy): Atomic number: 66, Atomic mass: 162.50 g.mol -1, Electronegativity: 1.2, Density: 8.6 g.cm-3 at 20°C, Melting point: 1412 °C, Boiling point: 2562 °C, Vanderwaals radius: unknown, Ionic radiu . . . View Full Definition