What are we? Important knowledge about us.

Note: As “Ta” is not a specific chemical substance, I will take Hydrogen (H₂) as an example.

1. Definition of Hydrogen

Hydrogen is a chemical element with the symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, accounting for approximately 75% of the universe’s visible mass.
1.1. Names
1.1.1. Common name: Hydrogen
1.1.2. English name: Hydrogen
1.2. Atomic mass: 1.00784 u
1.3. Atomic weight: 1.00794 u
1.3.1. Molecular structure: Each hydrogen molecule consists of 2 hydrogen atoms combined.
1.4. Ion structure: Hydrogen can form H+ ions when it loses an electron.

2. Properties of Hydrogen

2.1 Physical properties of Hydrogen
State: Gas
Color: Colorless
Odor: Odorless
pH: 7 (in water)
2.2 Chemical properties of Hydrogen: Hydrogen can react with many other chemical elements, forming various compounds.

3. Common chemical reactions with Hydrogen
   Metal reaction: 2Na + H₂ -> 2NaH
   Acid reaction: H₂ + HCl -> 2HCl
   Non-metal reaction: H₂ + O₂ -> 2H₂O
   Reaction with salt: H₂ + 2NaCl -> 2Na + 2HCl

4. Preparation of Hydrogen

4.1 Laboratory preparation of Hydrogen: Hydrogen is usually prepared from the reaction of acids and metals.
4.2 Industrial preparation of Hydrogen: On an industrial scale, Hydrogen is typically produced from the chemical reaction of methane gas with steam.