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Information valid for Ru-101 unless otherwise noted

Basic Information

Symbol: Ru
Atomic Number: 44
Mass: 101.07
Melting Point: 2250.0 C
Boiling Point: 3900.0 C
Number of Protons/Electrons: 44
Number of Neutrons: 57
Classification: Transition Metal
Crystal Structure: Hexagonal
Density @ 293 K: 12.2 g/cm3
Color: silvery

Atomic Structure

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

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 15
    Fifth Energy Level: 1


Isotope Half Life
Ru-96 Stable
Ru-97 2.89 days
Ru-98 Stable
Ru-99 Stable
Ru-100 Stable
Ru-101 Stable
Ru-102 Stable
Ru-103 39.27 days
Ru-104 Stable
Ru-105 4.44 hours
Ru-106 1.02 years


Date of Discovery: 1844
Discoverer: Karl Klaus
Name Origin: From the Latin word Ruthenia (Russia)
Uses: platinum alloys
Obtained From: pentlandite, pyroxinite