Chemical Elements.com - Hafnium (Hf)

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Basic Information

Name: Hafnium
Symbol: Hf
Atomic Number: 72
Atomic Mass: 178.49 amu
Melting Point: 2150.0 °C (2423.15 K, 3902.0 °F)
Boiling Point: 5400.0 °C (5673.15 K, 9752.0 °F)
Number of Protons/Electrons: 72
Number of Neutrons: 106
Classification: Transition Metal
Crystal Structure: Hexagonal
Density @ 293 K: 13.2 g/cm³
Color: Silver

Atomic Structure

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Isotopes

Isotope	Half Life
Hf-172	1.9 years
Hf-174	2.0E15 years
Hf-175	70.0 days
Hf-176	Stable
Hf-177	Stable
Hf-178	Stable
Hf-179	Stable
Hf-180	Stable
Hf-182	Stable
Hf-182	Stable

Facts

Date of Discovery: 1923
Discoverer: Dirk Coster
Name Origin: From the Latin word Hafnia (Copenhagen)
Uses: nuclear reactors
Obtained From: zircon

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