62
Sm
Samarium
150.362
Samarium
LANTHANIDE
Bohr Model: Electrons arranged in energy shells around the nucleus.
Samarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3.
Quick Facts
Atomic Number 62
Period 6
Group 8
Phase Solid
Appearance silvery white
About Lanthanides
Lanthanides are shiny metallic elements with atomic numbers 57–71. They are often called 'rare-earth elements' and are used in magnets and lasers.
History
Discovered By Lecoq de Boisbaudran
Named By Unknown
Physical Properties
Atomic Mass 150.362
Density 7.52 g/L
Molar Heat 29.54 J/(mol·K)
Phase Transition (Melting & Boiling Points)
Samarium melts at 1345 K and boils at 2173 K.
Atomic Properties
Electron Config [Xe] 4f6 6s2
Electronegativity 1.17
Electron Affinity 15.63 kJ/mol
Ionization Energy 544.5 kJ/mol
Orbital Filling Diagram
This diagram visualizes electron configuration according to the Aufbau principle and Hund's rule.
Boxes represent orbitals (s, p, d, f), while arrows indicate electrons with spin up or down.
Electrons fill lower energy levels first and occupy orbitals singly before pairing.
Photograph
External Resources
Study Guide
Atomic Number
The number of protons in the nucleus, which defines the element.
Atomic Mass
The average mass of an atom, including protons and neutrons.
Electronegativity
A measure of how strongly an atom attracts electrons in a bond.
Ionization Energy
The energy required to remove an electron from an atom.
Electron Config
The arrangement of electrons in the atom's energy shells.