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Information valid for Zr-91 unless otherwise noted

Basic Information

Symbol: Zr
Atomic Number: 40
Mass: 91.224
Melting Point: 1852.0 C
Boiling Point: 4377.0 C
Number of Protons/Electrons: 40
Number of Neutrons: 51
Classification: Transition Metal
Crystal Structure: Hexagonal
Density @ 293 K: 6.49 g/cm3
Color: Grayish

Atomic Structure

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

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 10
    Fifth Energy Level: 2


Isotope Half Life
Zr-86 16.5 hours
Zr-88 83.4 days
Zr-89 3.27 days
Zr-90 Stable
Zr-91 Stable
Zr-92 Stable
Zr-93 1530000.0 years
Zr-94 Stable
Zr-95 64.02 days
Zr-96 Stable
Zr-97 16.9 hours


Date of Discovery: 1789
Discoverer: Martin Klaproth
Name Origin: zircon (mineral)
Uses: nuclear applications
Obtained From: zircon, baddeleyite