1. Position and structure1. Li is an element whose periodic number is equal to twice the family number. 2.S is the element where the highest positive price is equal to 3 times the absolute value of the lowest negative price. 3.Be and Mg are elements whose outermost electron number is equal to the innermost electron number;4.Li, Na are the outermost electron number It is an element with 1/2 of the number of innermost electrons;5. The number of outermost electrons is twice the number of innermost electrons is C and Si; the three times the number of electrons is O, S; 4 Times are Ne and Ar. 6.Be and Ar are elements with the number of secondary outer layer electrons equal to the number of outermost electrons;7.Na is the number of secondary outer layer electrons equal to the number of outermost electrons 8 Times the element. 8. H, He, Al have the same number of electrons in the outermost layer of the atom as the outer electron layer. 9. The number of electrons on each electron layer of He and Ne is an element that satisfies 2n2. 10.H, He and Al are elements with the same group number and period number. 11.Mg is an element in which the number of electrons on the outermost layer of the atom is equal to 1/6 of the total number of electrons;12. The number of electrons on the outermost layer is equal to the total number of electrons 1/3 is Li and P; 1/2 is Be; equal is H and He. 13. C and S are elements whose family ordinal number is twice the period number. 14.O is an element whose family number is 3 times the period number. 15.C and Si are short-period elements with the highest positive price and the lowest negative price algebraic sum of zero. 16.O and F are elements whose highest normal price is not equal to the family ordinal number. 17. The neutron-free atomic hydrogen (H) in the daughter nucle Phenibut Suppliers us18. The elemental carbon that forms the most types of compounds19. Before the content in the crust The three elements O, Si, Al20. The most abundant element in the atmosphere N21. The outermost electrons are twice as many as the outermost elements (or second The number of electrons in the outer layer is the element with 1/2 of the outermost layer) C22. The number of electrons in the outermost layer is 3 times the element of the second outer layer (or the number of electrons in the second outer layer is the outermost 1/ 3 elements) O23. Elements whose outermost electrons are 4 times as many as the sub-outer layers (or elements whose sub-outer electrons are 1/4 of the outermost layer) Ne24. Elements Li and Si whose outermost electrons are 1/2 of the secondary outer electrons25. Elements Mg whose outermost electrons are 1/4 of the secondary outer electrons26. Element F with 5 more electrons in the outermost layer than in the second outer layer F27. Elements with 3 fewer electrons in the outermost layer than in the second outer layer P28. Element Al with 5 more electrons in the outermost layer than the number of electrons in the second outer layer29. The ratio of the total number of electrons outside the core to the number of electrons in the outermost layer is 3 : Element C of 230. The total number of electrons in the inner layer is twice the number of electrons in the outer layer. There are Li and P31. The number of electron layers and the number of outermost electrons Atoms with equal numbers are H, Be, Al32. The ratio of the total number of electrons outside the nuclear to the number of electrons in the outermost layer is 4:3. The element O33. The outermost layer Atoms with twice the number of electron lay Phenibut Suppliers ers are related to He, C, and S34. Atoms with the same number of electrons in the outermost layer as the second outer layer are Be, Ar 35. The two elements of X and Y can form two compounds of X2Y and X2Y2 (or form Na2O, Na2O2, H2O, H2O2 with atomic ratio 2:1 and 1:1.Second, content and physical Properties1.O is the element with the largest mass fraction in the crust, followed by Si, and Al is the metal element with the largest mass fraction in the crust.2.H is the lightest element Metal element; Li is the lightest metal element.3.Na is an element whose flame color reaction is yellow; K is an element whose flame color reaction is purple (observed through blue cobalt glass). 4.Si is the artificially produced element with the highest purity; C is the hardest element in natural substances.5.N is the most soluble element in gaseous hydrides ; O is the non-metallic element with the highest boiling point of hydride.6. At room temperature, F and Cl are elements with colored gases as simple substances.7.C is the most species of compounds that form The increase in the content of the highest valence oxides will cause the “greenhouse effect” element.8.Cl is the most easily liquefied gas, The hydrate of the highest oxide is the most acidic element. 3. Chemical properties and uses1.F is a non-metallic element that reacts most violently with water. 2.N is an element that can react with gaseous hydride and its highest valence oxide corresponding hydrate. 3.S is an element that can react with gaseous hydrides and its low-valent oxides to form this element. 4.P is an element that can ignite spontaneously in the air. 5.F is an element that can engrave glass in an aqueous solution of gaseous hydride. 6.O is that there are two Buy Phenibut Online allotropes that are the most important elements for human survival. 7.Mg is a metal element that can burn in CO2 and N2. 8. The simple elements of Li, Na, and F react with water at room temperature to emit short-period elements. Four, 10 electron particle group1. Atom Ne2. Molecule CH4, NH3, H2O, HF3. Cation Na+, Mg2+, Al3+, H3O+4. Anion N3-, O2-, F-, OH-Five, 18-particle microelectric group 1. Atom Ar 2. Molecule SiH4, PH3, H2S, HCl, F2, H2O3. Cation K+, Ca2+, PH4+4. Anion P3-, S2-, Cl-5. Special cases: F2, H2O2, C2H6, CH3OH, CH3F, N2H46. The total number of extranuclear electrons and the number of protons are the same Particles are1.Na+, H3O+2.F-, OH-3.Cl-, HS-4 .N2, CO, C2H27. The relationship between the atomic numbers of the elements of the same family in the upper and lower periods1. The difference in the atomic numbers of the elements of the same family in the second and third periods is 8 p>2. The atomic number difference of the elements of the same family in the third and fourth periods is 8 or 18, the IA and ⅡA are 8, and the other groups are 183. The atoms of the same family in the fourth and fifth periods The difference between ordinal numbers is 18. 4. The difference between the atomic numbers of the elements of the same family in the fifth and sixth periods is 18 or 32. 5. The difference between the atomic numbers of elements of the same family in the sixth and seventh periods is 32. Eight. Characteristic image1. Flame reaction: Na+ (yellow), K+ (purple). 2. Light yellow solid: S or Na2O2 or AgBr or FeS2. 3. Colored solution: Fe2+ (light green), Fe3+ (yellow), Cu2+ (blue), (purple). 4. Colored solids: red (Cu, Cu2O, Fe2O3), reddish brown [Fe(OH)3], blue [Cu(OH)2], black (CuO, FeO, FeS, CuS) , Ag2S, PbS), yellow (AgI, Ag3PO4), white [Fe(OH)2, CaCO3, BaSO4, AgCl, BaSO3]. 5. Gas: Cl2 (yellow-green), NO2 (red-brown). 6. Characteristic reaction phenomenon: Fe(OH)2 Fe(OH)3, white to grayish green to reddish brown. (Source network invasion and deletion)