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Chemical wiki: The ambient temperature of the metal coins can not be too high, and the metal coins are afraid of heat. Because the higher the temperature of the metal, the more chemically active it is. Experiments show that a copper wire placed at room temperature and placed on the flame of an alcohol lamp, the speed of chemical reaction with oxygen is very different.

Fourth, metal coins of different materials should not be stored together, because their chemical activity is not the same. For example, some antique coin lovers, in order to maintain the "original ancient style" of the coin, are not willing to polish and remove rust, and the ancient coin may be accompanied by a layer of inorganic salt compounds containing crystal water, the most common is the patina on the copper coin. When metal coins of different materials are put together with such coins attached to a layer of crystalline compounds, displacement reactions and galvanic reactions are easy to form, resulting in more serious corrosion.

WIKI 1, Li is an element whose periodic ordinal number is equal to twice the family ordinal number. 2, S is the element whose highest positive valence is equal to three times the absolute value of the lowest negative valence. 3. Be and Mg are elements in which the number of electrons in the outermost layer is equal to that in the innermost layer; Li and Na are elements in which the number of electrons in the outermost shell is half the number of electrons in the innermost shell; Three times as many as C and Si; Three times the O, S; Four times as many as Ne and Ar. 

4, Be, Ar is an element whose outer electron number is equal to the number of outermost electrons; Mg is an element in which the number of electrons in the outer shell is four times the number of electrons in the outermost shell; Na is an element that has eight times the number of electrons in its outermost shell. 5, H, He, Al is the number of electrons in the outermost shell of the atom equal to the number of electrons in the outer core. 

6. The number of electrons on each electron shell of He and Ne meets the elements of 2n2. 7, H, He, and Al are elements whose family Ordinal Numbers are the same as their periodic numbers. 8. 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; 1/3 is Li, P; 1/2 has Be; The equivalent is H and He. 

9, C, S are elements whose ordinal number is twice the number of periods. 10, O is an element whose ordinal number is three times the number of periods. 11, C, Si are short-period elements with the highest positive valence and the lowest negative valence algebra and are zero. 12, O, and F are the elements whose highest positive valence is not equal to the family ordinal. 

Chemical wiki 1, 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 non-metallic element; Li is the lightest metallic element. 3. Na is an element whose flame color reaction is yellow; K is an element whose flame color reacts as purple (viewed through blue cobalt glass). 4, Si is the highest purity artificially produced element; C is the hardest element in natural substances. 5. N is the most water-soluble element of gaseous hydride; O is the nonmetallic element with the highest boiling point of hydride. 6, at room temperature, F and Cl are elemental elements with colored gases. 

7. C is the element that forms the most types of compounds, and the increase in the content of the highest oxides will lead to the "greenhouse effect". 8. Cl is the most easily liquefied gas and the most acidic element of the hydrate of the highest oxide. 3, chemical properties and uses