|Group||4||Melting point||2233°C, 4051°F, 2506 K|
|Period||6||Boiling point||4600°C, 8312°F, 4873 K|
|Block||d||Density (g cm−3)||13.3|
|Atomic number||72||Relative atomic mass||178.49|
|State at 20°C||Solid||Key isotopes||177Hf, 178Hf, 180Hf|
|Electron configuration||[Xe] 4f145d26s2||CAS number||7440-58-6|
|ChemSpider ID||22422||ChemSpider is a free chemical structure database|
- Hafnium is a tetravalent transition metal with atomic number 72 and represented with the symbol Hf in the Periodic Table.
- Hf was named after the city in which it was discovered in, Copenhagen whose Latin name is Hafnia.
- Hafnium is a shiny and silvery metal exhibiting ductile features.
- It is usually resistant to corrosion and exhibits similar chemical properties to that of zirconium. This similarity is because of the presence of valence electrons which are same and that of the same group.
- The impurities present in the zirconium highly affects the hafnium metal. Hence both of them are considered to be the most inseparable.
- When reacted with water, a thin film of a protective layer is formed on the metal which shows the occurrence of corrosion.
- There is no effect of acids over the metal, but still, when ignited in the presence of oxygen, the metal produces oxides. This metal is highly resistant to some of the concentrated alkalis.
- Around 5.8 ppm of the upper layer of the earth’s crust constitutes of this metal. This element does not exist freely in the environment.
- Hafnium has a unique property of capturing neutrons. Hence it is used in the control rods of reactors as well as nuclear submarines
- Its compounds are used in the ceramic and alloy industries as they have higher melting points.
- It is widely utilized in the microprocessors as they are involved in the reduction of leakage current.
- It is also used in incandescent and gas-filled lamps.
- This metal serves as electrode in the process of plasma cutting as it gives out electrons
- Not hafnium, but the compounds of this metal are said to be toxic in nature. These compounds are said to possess fire hazards and explosive properties.
- An overexposure of this can cause several health disorders such as developing irritation in eyes, mucous membranes, and skin. There are not many environmental impacts shown by hafnium except few of them occurring very rarely.