Zinc
Definition and meaning of Zinc in chemistry.
Zinc is a slightly brittle transition metal denoted by the chemical symbol Zn and atomic number 30. It presents a silvery-gray appearance when surface oxidation is removed and serves as a vital anti-corrosion agent in modern manufacturing.
In more detail
Zinc exhibits diamagnetic properties and features an electron configuration with a completed d-subshell, behaving somewhat similarly to magnesium as its divalent ion is of similar size and its only common stable oxidation state is +2. In the Earth's crust, it is most commonly found as the mineral sphalerite, a zinc sulfide ore that often crystallizes alongside lead and silver deposits. When exposed to ambient air, the pure metal tarnishes rapidly to form a tightly adhering, protective passivation layer of basic zinc carbonate that prevents any further atmospheric degradation of the underlying material. Zinc is moderately reactive and will react vigorously with both strong acids and alkalis to release hydrogen gas, clearly demonstrating its amphoteric chemical behavior in aqueous solutions. Its primary and most economically significant industrial application leverages its ability to protect iron and steel components from rusting through the widespread metallurgical process of galvanization.
Key facts
| Field | General Chemistry |
|---|---|
| Symbol | Zn |
| Atomic number | 30 |
| Atomic mass | 65.38 u |
| Category | Transition Metal |
| State at room temperature | Solid |
| Melting point | 419.53 °C (787.15 °F) |
| Biological role | Essential trace element for human metabolism. |
Steel beams and automotive body parts are frequently dipped in molten zinc to create a galvanized coating that acts as a sacrificial anode, preventing rust.
Frequently asked questions
What is galvanization?
Galvanization is the process of applying a protective zinc coating to steel or iron to prevent rusting, as zinc will preferentially oxidize before the underlying iron.
How is zinc used in batteries?
Zinc serves as the fundamental anode material in many common battery types, including standard carbon-zinc alkaline batteries and zinc-air hearing aid batteries.