The chemical symbol is Pb.

The atomic number is 82. Lead is a soft heavy metal, toxic, and a weak metal with ductility. The natural color of lead is bluish white, and its surface is quickly covered with a layer of dark gray oxide in the air. Lead is used as building materials, lead-acid batteries, bullets and shells, as well as solder, trophies and some alloys. Among all stable chemical elements, lead has the highest atomic number.

Lead is an amphoteric metal element, and its main oxidation numbers are +2 and +4.

At (1) room temperature, lead reacts with oxygen, water and carbon dioxide in the air, forming a dense basic lead carbonate protective film on the surface, losing its metallic luster.

4Pb+2O2+2CO2+2H2O

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2PbCO3。 Pb(OH)2↓

(2) When heated, lead can directly react with oxygen, sulfur, halogen and other nonmetals to generate oxides, sulfides and halides.

2Pb+O2

2PbO

Lead+sulfur

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Lead +X2

PbX2

(X=F，Cl，Br，I)

(3) In the presence of air, lead can slowly react with water to generate lead hydroxide;

Pb+O2+2H2O

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Lead dihydrogen phosphate

(4) Lead reacts with acid to produce lead (II) compound.

(1) lead reacts with dilute hydrochloric acid or dilute sulfuric acid, and the reaction is terminated due to the formation of insoluble PbCl2 and PbSO4;

Lead +2 hydrochloric acid

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PbCl2↓+H2↑

(white)

Lead+sulfuric acid

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PbSO4↓+H2

(white)

(2) dissolving lead in hot concentrated hydrochloric acid or concentrated sulfuric acid;

Lead +3 hydrochloric acid

H[PbCl3]+H2↑

Lead +3H2SO4

lead sulfate

+

SO2↑+2H2O

③ Lead does not react with concentrated nitric acid, but with dilute nitric acid to produce soluble lead nitrate;

3Pb+8 nitric acid

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3Pb(NO3)2+2NO↑+4H2O

④ In the presence of oxygen, lead can be dissolved in acetic acid to produce soluble lead acetate, which is the principle of leaching lead from lead ore with acetic acid:

2Pb+O2+2H2O

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Lead dihydrogen phosphate

2Pb(OH)2+2HAc

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Lead (Ac)2+2H2O

Pb(Ac)2 is fake salt, because it cannot have separate Pb2+ and Ac- ions like other salts in aqueous solution, but is a complex formed by Ac- ions and Pb2+.

⑤ In strong alkali solution, lead can be slowly dissolved to produce lead sulfite;

Lead +2 sodium hydroxide

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Lead dioxide +H2

Or write

Lead+sodium hydroxide +2H2O

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Na[Pb(OH)3]+H2