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Anonymous users2024-02-06It depends on what stage you are. In middle school chemistry, students are the basics of elemental chemistry (including the periodic law, alkali metals, alkaline earth metals, non-metallic elements and subgroups of chromium, manganese, iron, copper, zinc, silver, mercury and other elements), structural chemistry (molecular structure and chemical properties, coordination compound structure, crystal chemistry basics, etc.), physical chemistry basics (including chemical thermodynamics, chemical kinetics, catalysis, electrochemistry, etc.), organic chemistry basics (common small molecule organic matter and polymer knowledge), Experimental chemistry (laboratory rules, knowledge and use of instruments, principles of experiments, design of experiments, etc.). For undergraduates, basic inorganic chemistry (periodic law and the properties, reactions, structures, etc. of all elements), organic chemistry (definition, properties, structure, synthesis, reaction mechanism of organic small molecules, etc.), physical chemistry (chemical thermodynamics, chemical kinetics, catalysis, interface, electrochemistry, etc.), experimental chemistry (undergraduate students are required to enter the laboratory, and most middle schools in China do not open laboratories at the middle school level).
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Anonymous users2024-02-05First cycle elements: 1 hydrogen (qīng) 2 helium (hài).
Second Cycle Elements: 3 Lithium (lǐ) 4 Beryllium (pí) 5 Boron (péng) 6 Carbon (tàn) 7 Nitrogen (dàn) 8 Oxygen (yǎng) 9 Fluorine (fú) 10 Neon (nǎi).
Third Cycle Elements: 11 Sodium (nà) 12 Magnesium (měi) 13 Aluminum (lǚ) 14 Silicon (guī) 15 Phosphorus (lín) 16 Sulfur (liú) 17 Chlorine (lǜ) 18 Argon (yà).
Fourth Cycle Elements: 19 Potassium (jiǎ) 20 Calcium (gài) 21 Scandium (kàng) 22 Titanium (tài) 23 Vanadium (fán) 24 Chromium (gè) 25 Manganese (měng) 26 Iron (tiě) 27 Cobalt (gǔ) 28 Nickel (niè) 29 Copper (tóng) 30 Zinc (xīn) 31 Gallium (jiā) 32 Germanium (zhě) 33 Arsenic (shēn) 34 Selenium (xī) 35 Bromine (xiù) 36 Krypton (kè).
Fifth Cycle Elements: 37 Rubidium (rú) 38 Strontium (sī) 39 Yttrium (yǐ) 40 Zirconium (gào) 41 Niobium (ní) 42 Molybdenum (mù) 43 Technetium (dé) 44 Ruthenium (liǎo) 45 Rhodium (lǎo) 46 Palladium (bǎ) 47 Silver (yín) 48 Cadmium (gé) 49 Indium (yīn) 50 Tin (xī) 51 Antimony (tī) 52 Tellurium(dì) 53 Iodine (diǎn) 54 Xenon (xiān).
Sixth Cycle Elements: 55 Cesium (sè) 56 Barium (bèi) 57 Lanthanum (lán) 58 Cerium (shì) 59 Praseodymium (pǔ) 60 Neodymium (nǚ) 61 Promethium (pǒ) 62 Samarium (shān) 63 Europium (yǒu) 64 Gadolinium (gá) 65 Terbium (tè) 66 Dysprosium (dī) 67 Holmium (huǒ) 68 Erbium (ěr) 69 铥 (diū) 70 Ytterium (yì) 71 镥 (lǔ) 72 Hafnium (hā) 73 Tantalum (tǎn) 74 Tungsten (wū) 75 Rhenium (lái) 76 Osmium (é) 77 Iridium (yī) 78 Platinum (bó) 79 金 (jīn) 80 Mercury (gǒng) 81 Thallium (tā) 82 Lead (qiān) 83 Bismuth (bì) 84 Polonium (pō) 85 Astatine (ài) 86 Radon (dōng).
Seventh Cycle Elements: 87 镫 (fāng) 88 镭 (léi) 89 Actinide (ā) 90 Thorium (tǔ) 91 镤 (pú) 92 Uranium (yóu) 93 Neptium (ná) 94 Plutonium (bù) 95 Americium (méi) 96 锔 (jú) 97 Berkelium (péi) 98 锎 (kāi).
Gas washing cylinders generally have the following functions: >>>More
It depends on the difference in each place, but the main ones in the midterm include. >>>More
1.Oxygen production:
2kclo3 catalyst 2kCl+3O2 2kmNO4 heats K2mNO4+mNO2+O2 2H2O2Mno2 2H2O+O2 >>>More
Conservation of electric charge. Manganese changes from 7-valent to 2-valent, giving five electrons. The oxygen in hydrogen peroxide changes from negative 1 valence to 0 valence oxygen, losing two electrons. >>>More
Observational method. It is directly by observing reactants and products, and balancing according to the law of conservation of mass and the law of conservation of atoms. >>>More