Ask for junior high school and high school valence.

Valency formula:

The main valency of common elements.

chlorochlorobromoiodine negative monovalent; N-monohydrogen silver with potassium sodium.

The minus two of oxygen should be remembered first; n-dimagnesium, calcium, barium and zinc.

positive three is aluminum, positive four silicon; Let's put the price change down.

All metals are regular; One or two coppers come two or three irons.

Manganese is 24 and 67; The two or four of carbon should be kept in mind.

non-metallic negative main is uneven; Chlorine is negative one positive one five seven.

Nitrogen and phosphorus minus three and plus five; Different phosphorus, three nitrogen, two or four.

Sulfur has minus two, positive, four-six; It will be cooked when you use it while memorizing it.

Common root price formulas:

monovalent ammonium nitrate; Hydrohalide hydroxide.

permanganate chlorate; Perchlorate acetate.

divalent carbonate sulfate; Manganese hydrosulfate.

Suspense ammonium is the normal price; Negative three has a phosphate group.

Valency formula two.

monovalent potassium hydrochloride sodium silver; Divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentanitrogen phosphorus; 23 iron, 24 carbon, 24 6 sulfur are all Qi; All copper is most commonly bivalent.

Monovalent hydrochloride, potassium, sodium, silver, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentavalent phosphorus, ditrifer, ditetracarbon, and 246 sulfur are complete, and copper and mercury are the most common.

Monovalent potassium hydrochloride sodium silver - monovalent potassium hydrochloride sodium silver; Divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentanitrogen phosphorus; 23 iron, 24 carbon, 24 6 sulfur are all Qi; Copper-mercury bivalent is the most common.

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Monovalent potassium potassium hydrogen chloride sodium silver.

Divalent oxygen, calcium, barium, magnesium, zinc.

The trivalent is aluminum, two or three iron.

Positive, left, negative and right should be remembered.

**Oxygen, low price, both complete.

Monovalent potassium hydrogen chloride, sodium silver, divalent oxygen, calcium barium, magnesium, zinc, sulfide, aluminum, trisilicon, tetrasilicon, copper, mercury, diferric, ditri, copper, mercury, diiron, dioxide, potassium, magnesium, magnesium, zinc, divalent oxygen, calcium oxygen, barium, magnesium, zinc

Monovalent potassium bichloride, sodium silver, divalent oxygen, calcium, magnesium, barium, zinc, trialuminum, tetrasilicon, pentanitrogen, phosphorus, ditriiron, 244 carbon, 246 sulfur are complete, and copper and mercury are the most common. Don't forget that the quality price of the unit is zero.

Negative monovalent hydroxide nitrate, divalent sulfate carbonate, negative trivalent is phosphate, and positive monovalent is ammonium. Note: The algebraic sum of the valency of each element of the compound is zero, and the ammonium is an atomic cluster; +2 valence iron is called "ferrous iron"; +1 valence copper is called "cuprous", S is -2 valence in the absence of oxygen, and 4 or 6 valence when combined with oxygen.

The SO3 atomic group is called "sulfite", and the Cl is -1 valence in the absence of oxygen, and 1, +3, +5 or +7 valence when combined with oxygen.

Valence formulas for junior high school:

Potassium, sodium, silver, hydrogen positive one valent, barium zinc, calcium magnesium positive bivalent, one or two copper, two ferrous iron, cuprous ferrous iron is low price, aluminum is positive trioxygen negative two, chlorine is negative one is the most common, sulfur has negative two positive four six, positive two positive three iron variable, positive four silicon, two or four carbon, the zero price of the element is never the same.

Negative hydroxide nitrate, negative disulfate carbonate, minus three remember the phosphate, positive monovalent is ammonium, other elements have valency, first die and then live to calculate.

Monovalent potassium hydrochloride, sodium silver, divalent barium oxygen, calcium, magnesium, zinc.

Trialuminum, tetrasilicon, pentavalent phosphorus, ditetracarbon, tripentanitrogen.

246 iron sulfur 23, copper mercury 12 is a conversion.

The zero price of the element will never change.

Brief introduction.

Valency indicates the number of electrons gained and lost by atoms when they are combined with each other. Valency is also a property exhibited by an element in the formation of a compound. When elements are combined with each other, the ratio of the number of reactant atoms is not fixed, but is determined by the number of electrons in the outermost shell of the atom.

For example, a sodium ion (valency of +1, loss of an electron) must be combined with a chloride ion (valency of -1, gain an electron). And one magnesium ion (valency of +2, loss of two electrons) must be combined with two chloride ions.

The valence of junior high school has potassium, sodium, silver, hydrogen, positive monovalent, calcium, magnesium, barium, zinc, positive bivalent, one or two copper, two iron, aluminum is positive trioxygen, negative two, chlorine is negative one, the most common, sulfur has negative two, positive four, six, positive two, positive three, variable, etc.

Valency is the property of an element when one atom of an element is atomized with other elements (i.e., to form a compound). In general, the valence of valency is equal to the number of electrons gained and lost by each atom during compounding, that is, the number of electrons gained and lost when the element can reach a stable structure, which is often determined by the electronic configuration of the element, mainly the outermost electron configuration, and of course may also involve the substable structure composed of sublayers that the subouter shell can achieve.

1.Potassium, sodium, silver, hydrogen, positive monovalent, calcium, magnesium, barium, zinc, positive bivalent, monodicat, copper, ditriiron.

2.Aluminum is positive trioxan minus two, chlorine is minus one is the most common, sulfur has minus two plus four hexa, plus two plus three iron variable.

3.N-tetrasilicon, ditetracarbon, elemental zero price forever, minus mononitrate hydroxide, minus disulfate carbonate.

4.Remember the phosphate group, the positive one is the ammonium root, and the other elements have valence, which is calculated by dying first and then living.

5.Monovalent potassium hydrochloride, sodium silver, divalent barium oxygen, calcium, magnesium, zinc. Trialuminum, tetrasilicon, pentavalent phosphorus, ditetracarbon, tripentanitrogen.

6.246 iron sulfur 23, copper mercury 12 is a variable price, the element is zero do not need to be calculated.

7.Positive potassium, sodium, silver, hydrogen ammonia, n-dicalcium, copper, magnesium, barium, zinc, aluminum, trisilicon, phosphorus, positive five, chlorine, often negative one, oxygen negative two.

8.Iron becomes 23C24, hydroxide nitrate minus 1, sulfate carbonate minus 2, 246 sulfur are complete.

9.n-monohydrochloride, potassium, sodium, silver, n-dicalcium, magnesium, barium, zinc, mercury. Positive trialuminum, negative dioxide.

10.Positive one sub-copper, positive two copper, positive two ferrous metal, positive three iron.

11.Negative monohydroxide nitrate, negative disulfite carbonate, positive monovalent ammonium, monovalent sodium hydrochloride potassium silver.

Divalent magnesium oxide, calcium, barium, zinc, trivalent elements, uranium, aluminum, tetravalent carbonic acid, pentavalent phosphorus).

Positive copper, potassium, potassium, sodium, silver, copper, magnesium, calcium, barium zinc.

3. Aluminum, 4 silicon, 46 sulfur, 245 nitrogen, 35 phosphorus.

157 chlorine 23 ferric, 2467 manganese is positive.

Carbon has positive four and positive two, and then keep the negative price in mind.

Negative iodine bromo, fluorochlorine, negative dioxysulfur, phosphorus triazonide.

Monovalent potassium hydrochloride, sodium silver, divalent oxygen, calcium barium, magnesium zinc.

3. Aluminum, 4 silicon, pentavalent phosphorus, 23 iron, 24 carbon.

Nitrogen is found in the first to fifth valents, with copper mercury bivalent being the most common.

1) There are positive and negative valences.

2) Oxygen is usually -2 valence.

3) Hydrogen usually shows +1 valence.

4) When metallic elements and non-metallic elements are combined, metallic elements show positive valence, and non-metallic elements show negative valence (generally speaking, the positive valence is written in the front, and the negative valence is written in the back).

5) Some elements can show different valencies in the same substance.

6) The algebraic sum of positive and negative valencies in a compound is 0

7) The valency of an element is a property exhibited by the atoms of an element when forming a compound, so in a elemental molecule, the valency of an element is 0.

Monovalent potassium hydroxide sodium silver. Divalent oxygen, calcium, barium, magnesium, zinc. 3. Aluminum, tetrasilicon, pentavalent phosphorus.

Two or three iron, two or four carbon. Heptachloro, tripentachlorine. Two, four, and six sulfur are complete.

Copper-mercury bivalent is the most common.

Monovalent bromide, copper, nitrochloride, fluoride, iodine. Divalent manganese nitrogen sulfurite.

Pentabromotriphosphatemonovalentammonium. Tetrahexanese, mononitric acid.

Pentoginseng iodine, disulfate. Carbonic acid di, chlorine tripenta.

Monohydroxide, tetravalent nitrogen. The commonly used valence has been memorized!