英语三年级重点习题223期

AlN C.(4) the addition of acid precipitation is generated by precipitation such as SiO32-, AlO2-, S2O32-, and C6H5O- (at room temperature).(5) there is a "electrolytic" condition which is usually associated with the following seven representative:A.: water electrolysis oxygen acid H2SO4 (AQ), NaOH (AQ), alkali oxygen acid salt containing active Na2SO4 metal (AQ)B. type: deoxygenated decomposition of the electrolyte such as HCl (AQ) (except HF), inert metal hydrogen acid salts such as CuCl2 (AQ)C. (AQ), CuSO4 (AQ), an inert metal, such as AgF (), a type of non reactive metal.D. type: alkali hydrogen students active metal deoxygenated salts such as NaCl (AQ)E. electrolysis of molten ionic compounds, such as Al2O3 (L), NaCl (L)9 questions nine: the nature of common elements or structural characteristics(1) hydrogenA. the number of electrons outside the nucleus is equal to the number of atoms in the electron layer;B. has no neutrons;C. loses an electron as a proton;D. have a same electronic and electronic core helium atomic arrangement of atoms;E. is the lightest atom; relative atomic mass is minimized; the formation of elemental most difficult liquefaction elements;Atomic radius of F. atom;The formation of G. elements as the same conditions the relative density of the smallest element;The formation of H. elements as the most ideal fuel gas;I. forming an indispensable element of acid;(2) oxygen elementA. the outer electron number is 4 times the number of electrons;B. the outermost electron number is 3 times the number of atoms in the outer layer;C. two is the same electronic and electronic neon atom atomic arrangement;D. is obtained with the same number of electrons in the same time as the same as that of the 8 electronic structure;E. elements in the most of the earth's crust;The formation of F. element is the second element in the air;The formation of G. element has an allotrope is in the stratosphere can absorb ultraviolet radiation elements;Elements of the H. energy and hydrogen elements forming the 10 core three electron molecule (H2O);I. energy and hydrogen element to form a liquid core 18 electron molecule (H2O2) elements;In all the compounds, hydrogen peroxide (H2O2) was the highest in J.;K. can form a number of atoms with hydrogen atoms than the elements of a 1:1 or a 1:2 type covalent liquid compound;The elements of the two kinds of ionic compounds, L., 1:1, and cation, can be formed by the formation of sodium and sodium;(3) carbon elementA. the outer electron number is 3 times the number of electrons;B. the outermost electron number is 2 times the number of atoms in the outer layer;C. the outermost electron number is the total number of nuclear 2/3 atoms;D. forms the most elements of the compound;The formation of E. element has an allotrope of material nature maximum hardness;F. can form a high melting point, high hardness material with boron, nitrogen, silicon and so on;G. energy and hydrogen elements in the formation of a tetrahedral configuration of 10 Electron molecule (CH4) elements;Elements of the H. to form a linear quad core molecule (C2H2) with hydrogen;Elements of the I. energy and oxygen elements in the formation of a linear three nuclear molecule (CO2).(4) nitrogen elementA. elements in the air;B. proteins and nucleic acids indispensable elements;The C. can form a triangular pyramid with a hydrogen element with a quad core 10 Electron molecule (NH3) element;The formation of D. gas hydrate (NH3) blue litmus paper can make wet red elements;E. can form acid, alkali and salt with three elements of hydrogen and oxygen;F. non metal is strong, but the formation of elemental elements commonly used as protective gas.(5) sulfur elementA. the outermost electron number is 3 times the number of atoms in the third layer;B. the difference between the number of the outermost electrons and the number of electrons in the third layer is equal to the number of atoms in the open square;C. the outermost electron number is less than the number of electrons in an atom of 2 electrons;D. the outermost electron number and the number of the innermost electrons and the number of the electrons that are equal to the number of electrons;E. in the short period of the same main family of the elements of the adjacent cycle, only the nuclear charge of sulfur is 2 times the number of nuclear charge, and the relative atomic mass of sulfur is 2 times the mass of oxygen;Elements of the f. energy and hydrogen element formation of 18 core three electron molecule (H2S); The formation of G. mass density is about 2 times the density of water;Elements of the yellow solid by the H. gaseous hydride and its gaseous oxide.(6) chlorine elementA. the outermost electron number is less than 1 of the non metallic element;Elements of the B. energy and hydrogen elements forming the 18 core two electron molecule (HCl); The formation of C. elements as the yellow green gas elements;。