What is Zn? Important knowledge about Zn.

1. Definition of Zn

Zn, also known as Zinc, is a chemical element in the periodic table, denoted by the symbol Zn and the atomic number 30. The atomic mass of Zinc is 65.38 Da and its atomic weight is 65.38. Zn molecules are typically in their elemental state, meaning each molecule consists of only one Zn atom. Zinc cannot form normal ions in its natural state.

2. Properties: Zn

2.1 Physical properties of Zn
At room temperature, Zinc is in solid state and has a silver-gray color, and is odorless. The pH of Zn compounds is usually neutral.

2.2 Chemical properties of Zn
Zinc can react with strong acids to produce hydrogen. It can also participate in oxidation-reduction reactions.

3. Common chemical equations with Zn
   Zn reacts with O₂ to form ZnO
   2Zn + O₂ -> 2ZnO

Reaction with acid:
Zn + H₂SO₄ -> ZnSO₄ + H₂

Reaction with nonmetals:
3Zn + N₂ -> Zn₃N₂

4. Preparation of Zn

4.1 Laboratory preparation of Zn
Zinc can be prepared through the reaction between zinc nitrate and sodium hydroxide.

4.2 Industrial preparation of Zn
In industry, Zinc is usually produced from sphalerite (ZnS) ore through a complex process including thermal decomposition, oxidation, and sulfurization.