1. Position in the Periodic Table and Bonding Rules (Core Exam Point: Classification Position → Property Correlation) Question 1 (2023 National A Paper) The following statements about non-metal elements and their compounds are correct ( ) A. Si is a metalloid, and its oxide SiO₂ is a basic oxide B. The highest valence oxides of … Read more
1. Position and Classification in the Periodic Table (Core Concept: Position → Structure → Properties) Question 1 (2023 National B Exam) Which of the following statements about metal elements is correct? ( ) A. All metal elements are located in the s-block and d-block of the periodic table B. Elements with fewer than 4 electrons … Read more
In the vast and wondrous world of the periodic table, the argon atom stands out as a paragon of noble tranquility. This unreactive and inert gas, represented by the chemical symbol Ar and atomic number 18, is more than just a chemical element; it is a testament to the beauty and order inherent in the … Read more
Hello, everyone. Today we will take a look at the hazardous chemicals in semiconductor manufacturing—Ammonium Ferrous Sulfate. 1. Basic Information Chemical Name in Chinese: 硫酸亚铁铵。 Chemical Name in English: FERROUS AMMONIUM SULFATE; Ammonium iron sulfate; Mohr’s salt. Molecular Formula: Fe2H8N2O4S; Fe2(NH4)2SO4. Molecular Weight: 392.1308. CAS No.: 2310045-89-3. 2. Composition/Information on Ingredients Composed of ammonium ions, … Read more
Source: Zhang Zhanling, Zhao Fei, Tan Wenlong. Effects Of Heat Treatment Process On 60Si2CrVA Spring Steel Microstructure And Properties [J]. Metal Heat Treatment, 2014, 39 (05): 104-107.
Thank you for your attention | Please feel free to share Introduction to the “Coupling of Phosphorus and Fluorine Industry and Creation of High-end Materials” Column The “Ecological Industry Science and Phosphorus Fluorine Engineering” column mainly publishes content related to the manufacturing of high-value products involving life and health, new energy, and new energy vehicles, … Read more