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Information valid for Rh-103 unless otherwise noted

Basic Information

Symbol: Rh
Atomic Number: 45
Mass: 102.9055
Melting Point: 1966.0 C
Boiling Point: 3727.0 C
Number of Protons/Electrons: 45
Number of Neutrons: 58
Classification: Transition Metal
Crystal Structure: Cubic
Density @ 293 K: 12.41 g/cm3
Color: silverish

Atomic Structure

[Bohr Model of Rhodium]
Number of Energy Levels: 5

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 16
    Fifth Energy Level: 1


Isotope Half Life
Rh-101 3.3 years
Rh-101m 4.35 days
Rh-102 2.9 years
Rh-102m 207.0 days
Rh-103 Stable
Rh-103m 56.12 minutes
Rh-105 35.36 hours
Rh-105m 40.0 seconds
Rh-106 29.9 seconds


Date of Discovery: 1803
Discoverer: William Wollaston
Name Origin: From the Greek word rhodon (rose)
Uses: coatings
Obtained From: by-product of nickel production