Hafnium

Statistics:

• Name: Hafnium
• Symbol: Hf
• Classification: Transition Metal
• Atomic Number: 72
• Atomic Mass: 178.49 g/mol
• Density: 13.31 g/cm³
• Melting: 2150°C
• Boiling: 5400°C
• Protons & Electrons:72
• Neutrons:106
• Discovered: 1923
• Discovered By: Coster and de Hevesy
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 32
• Level 5: 10
• Level 6: 2

Isotopes:

Isotope: Half-life

• ¹⁷²Hf: 1.87 years
• ¹⁷⁴Hf: 2.0e15 years
• ¹⁷⁵Hf: 70 days
• ¹⁷⁶Hf: stable
• ¹⁷⁷Hf: stable
• ¹⁷⁸Hf: stable
• ¹⁷⁹Hf: stable
• ¹⁸⁰Hf: stable
• ¹⁸²Hf: 9e6 years
• ^182m1Hf: 61.5 minutes

Brief Summary

Hafnium is a Transition Metal with the symbol 'Hf' and contains 72 Protons & Electrons with 106 neutrons in the nucleus of the atom. Hafnium has an atomic mass of 178.49 g/mol and, at a temperature of 20°C, has a density of 13.31 g/cm³. It will melt at a temperature of 2150°C and boil at 5400°C.

Hafnium was discovered by Coster and de Hevesy in 1923 and is named 'Hafnium' Latin word "Hafnia" meaning "Copenhagen".

Some common usages for Hafnium: nuclear reactors.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Hafnium :: Hf :: 72 - Chemical Element. 22 Nov. 2008 <http://www.chemicalelement.com/element/hafnium.html>.