Judgment of metal, method of judging the strength of metal

Liveliness: K>Zn>Fe>Sn>(H)>Cu>AG>Pt1) can not react with hot nitric acid only Pt, so F is Pt2) After D and E are in contact, E is easy to rust in humid air, indicating that E is more active than D (galvanic battery).

3) At room temperature, only A can react with water, and only KDEG can react with dilute sulfuric acid to release hydrogen, then DEG is Zn, Fe and Sn while B and C are Cu and Ag

4) When the elemental substance of B is put into the nitrate solution of C, C is precipitated.

Explain that B is more reactive than C, so B is Cu and C is Ag

5) Coating G on the surface of D, when the surface is damaged and comes into contact with the electrolyte solution, D corrosion occurs, indicating that D is more active than G, (galvanic cell).

And E is more lively than D, so the liveliness E>D>G, so E is Zn, D is Fe, and G is Sn Hence. a k

b cuc ag

d fee zn

f ptg sn

From (1), we can know that F is an inactive metal, and silver can react with hot nitric acid, so F is pt from (3) A is K Deg is Fe, Sn, Zn (the order is unknown) From (4) B is Cu, C is Ag

From (2) it is known that e is fe

From (5) the degree of activity is known d>g, so d is zn, g is sn, so, a:k, b:cu, c:ag, d:zn, e:sn, f:pt, g:sn

Take the metal activity order table and you'll know it all.

1. Under certain conditions, the metal element reacts with water. In general, the easier and more intense the reaction with water, its metallic properties.

The stronger. For example, the reaction between potassium and water is more violent than that of sodium and water, and the metallicity of potassium is stronger than that of sodium. Sodium reacts with water at room temperature, and magnesium reacts with water when heated, and sodium is more metallic than magnesium. In fact, on the other hand, the stronger the metallicity of the element, the more intense the reaction between its elemental elements and water.

2. Non-oxidizing at room temperature and at the same concentration.

The acid reacts to produce hydrogen. In general, the easier and more intense the reaction between metal elements and acids, the stronger the metallicity of their elements. For example, the reaction between magnesium and sulfuric acid is more violent than that of aluminum and sulfuric acid, and the metallicity of magnesium is stronger than that of aluminum.

In fact, the reverse is also true, the stronger the metallicity of the element, the more intense the reaction between its elemental elements and water.

3. The hydration of the most ** oxide is alkaline. The more alkaline it is, the more metallic its elements are. Due to the elements involved in high school, the comparison of the attributes of the golden model generally does not involve transitional elements.

Therefore, there is not much emphasis on the most ** oxides. In fact, on the other hand, the stronger the metallicity of the element, the stronger the alkalinity of the hydrate corresponding to its most ** oxide.

4. According to the metal activity table.

The metal at the top of the metal mobility table has strong metallic properties.

5. According to the displacement reaction between metal elements and salt solutions.

Since the metal activity of the metal reactant is greater than that of the metal product in the displacement reaction, the metallicity of the displaced metal is stronger than that of the replaced metal.

6. According to the name of the electrode in the galvanic battery. The metallicity of the negative electrode metal is stronger than that of the positive electrode metal. There are many counter-examples of this method of judgment, and it is generally applicable to the oxidation reaction between a metal and a non-oxidizing acid or salt solution.

7. According to the electrolytic cell.

In fact, this is the oxidation of the cation, and the metallicity of the corresponding element of the cation is weak.

1. According to the order of activity of the metal.

Such as: k ca na mg al zn fe sn pb (h) cu hg ag pt au

The activity of the elemental metal is weakened, and the metallicity of the element is also weakened.

2. Judging by the properties of the element and its compounds.

1) The more intense the reaction of the metal element with water or acid, the stronger the metallicity of the element.

2) The stronger the alkalinity of the hydrate corresponding to the most ** oxide, the stronger the metallicity of the element.

3. Displacement reaction between metal elements.

The more reactive metal manuscript silver displaces the less reactive metal with its salt solution, such as:

Zn + Cu + Zn + Cu, then the metallicity Zn>Cu4, according to the stronger the oxidation of the metal cation, the weaker the metallicity of the metal.

For example, Cu scatters the excitement + >Fe +, and the metallicity Cu 5 is judged according to the periodic table.

The same main family, from top to bottom: the metallic elementality gradually strengthens the socks.

1 Distinguishing method: Metallic elements are generally "Mercury" (except mercury); Non-metallic elements are generally on the side of the word "stone" or "gas".

2 Determinant: The classification of an element is determined by the number of electrons in the outermost shell of an atom.

Generally speaking, the outermost electrons of an atom are less than 4 and belong to metal elements and are prone to electron loss. cation formation;

The number of electrons in the outermost shell of an atom is greater than 4, which is a non-metallic element, and it is easy to obtain electrons and form anions.

3 Distribution in the periodic table:

1) Metallic elements are generally distributed on the left and bottom of the periodic table;

2) Non-metallic elements are generally distributed on the right side of the periodic table (except hydrogen) and above;

3) The noble gas elements are distributed on the far right of the periodic table.

4 The number of protons of an atom determines the type of element.

It can be distinguished by the radical of the element.

Unlike the outermost electron arrangement of an element, a metal is a metal with an outermost electron number of less than 4.

1. Judging by the oxidation of the element, in general, the stronger the oxidation, the stronger the corresponding non-metallic.

2. From the perspective of the degree of reaction between elemental matter and acid or water, the more intense the reaction, the stronger the non-metallic property. (For example, the reaction intensity of F2, Cl2, Br2 and H2O decreases sequentially, and the non-metals decrease sequentially).

3. It is judged by the stability of the corresponding hydride. The more stable the hydride, the stronger the metallicity of the non-cracking source, 4. It is judged by the difficulty of combining with hydrogen. The easier the chemical reaction, the stronger the non-metallic properties.

5. Judging by the acidity of the hydrate corresponding to the most ** oxide, the stronger the acidity, the stronger the non-metal;

6. Judging by the reducibility of the corresponding lowest valence anion, the stronger the reducibility, the weaker the corresponding non-metallic state;

7. Judged by the replacement reaction! Non-metallic strong forced weak!

1. Judging by the difficulty of converting hydrogen from the reaction of elemental matter with water (or acid), the easier it is to replace hydrogen with elemental matter and water (or acid), the stronger the metallicity of the element.

2. Judging by the alkalinity of the hydrate of the most ** oxide, that is, hydroxide. The more alkaline the hydroxide, the stronger the metallicity of the element.

3. It is judged by the order table of metal activity. In order of metal activity, the metallicity of metal elements decreases sequentially.

4. Destruction is judged by the reduction of elementality. Or the stronger the reduction of the element, the stronger the metallicity of the corresponding element.

5. It is judged by the displacement reaction between the element and the compound. Follow the law of forced weakness.

6. Judging by the oxidation strength of metal cations. In general, the weaker the oxidation of metal cations, the stronger the metallicity of the corresponding element. Special case: Trivalent iron is more oxidizing than bivalent copper, but iron is more metallic than copper.

7. Judged by the positive and negative electrodes of the galvanic battery. Generally, in the case of Yu Xiao, the metal electrode with strong activity is used as the negative electrode.