How to remember the valence, how to remember the valency in chemistry

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.

Metal Activity Order Table:

Junior high) potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead, hydrogen, copper, mercury, silver, platinum.

High school) potassium, calcium, sodium, magnesium, aluminum, manganese, zinc, chromium, iron, nickel, tin, lead, hydrogen; Copper, mercury, silver, platinum.

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.

The law of metal activity.

Potassium, sodium, calcium, magnesium, aluminum, zinc-iron, tin, lead, (hydrogen), copper, mercury, silver, platinum.

Rote memorization, there is no pattern, and there are many questions, so I will naturally write them down.

(1) Valency principle: In a compound, the algebraic sum of positive and negative valency of elements is zero.

2) In compounds, hydrogen usually shows +1 valence and oxygen usually shows -2 valence.

3) Metallic elements usually have a positive valence, and non-metallic elements usually have a negative valence (but in non-metallic oxides, oxygen has a negative valence, and another non-metallic element has a positive valence).

4) In elemental molecules, the valency of the element is zero.

5) Many elements have variable valence. For example, FE has +2 and +3 valences; CL has -1, +1, +3, +5, +7 valences.

6) The valency of an atomic cluster is calculated by the algebraic sum of the positive and negative valencies of the atoms that make up the element.

Supplement: It will be the valency formula, as for the valency of some special substances, it must be memorized separately, and you will naturally know if you encounter more. The valency of ordinary substances is still according to the valency formula...

36 chemical elements: hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chloride, argon, potassium, calcium. The valency of common atoms should be memorized according to the memorization formula:

monovalent potassium, sodium, fluorohydrosilver, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentavalent phosphorus; Two or three iron, two or four carbon. 246 sulfur is complete, and copper mercury bivalent is the most common. There are seven cycles in the periodic table, three of which are long, three are short, and one is incomplete, and there are a total of eighteen longitudinal rows, which are sixteen tribes, of which seven are major, seven are subordinate, one is zero, and one is eight.

The Song of Valence.

Hydrogen, sodium, potassium, silver, chlorine, monovalent, divalent magnesium oxygen, barium, calcium and zinc, trialuminum, tetrasilicon, pentavalent phosphorus, ditriiron, ditetracarbon, 246 sulfur are complete, copper and mercury bivalent is the most common, and the element is zero and forever.

Note: Chlorine is negative bivalent, oxygen is negative bivalent, bivalent sulfur is negative bivalent, and the rest are positive.

The periodic table memory slips smoothly.

I am hydrogen, I am the lightest, and rockets rely on me to carry satellites;

I'm helium, I'm a scoundrel, I'm the best at gaining and losing electrons;

I am lithium, which has a low density, and bubbles up when it encounters water and acid;

I am beryllium, playing with the skin, although the metal is difficult to ionize;

I'm boron, a little red, and I'm poor when it comes to electrons;

I am carbon, slow to react, able to form both chains and rings;

I am nitrogen, I am flame retardant, and ammonia can be synthesized by hydrogenation;

I'm oxygen, don't think about it, I'll be panicked when I leave;

I'm fluorine, the most vicious, grab an electron and you'll be full of potatoes;

I'm neon, and I'm not bad, and the red light is emitted when the electricity is turned on;

I am sodium, I have a big temper, and when I encounter acid and water, I will be angry;

I am magnesium, I love beauty the most, and photography fireworks shine brightly;

I am aluminum, at room temperature, in concentrated sulfuric acid to take a bath;

I am silicon, black and gray, and the information elements pile me up;

I am phosphorus, a pest, and my name is on the list of poisons;

I am sulfur, I have a long history, and Shenyou Maodian metal is the best;

I am chlorine, the informant is yellow and green, and I rob the metal electron;

I am argon, the activity is poor, and the neon purple light I will emit;

I'm potassium, add fire, superoxide to the house; I am calcium, body love, bones and teeth I am there;

Keep in mind that valency can be done in a few ways:

1.Understand the structure of the periodic table: The periodic table is arranged according to the atomic number of the elements, and the larger the atomic number, the larger the valence range will be, in general. Familiarity with the structure of the Zhou-Huyuan period table can help us understand the valency of the element.

2.Grasp the valency of common ions: Many elements form ions, and the valency of ions can be determined based on electric charge. Knowing common single-atom ions (e.g., Na+, Cl-, Fe2+, etc.) and the valencies they produce can help with memory.

3.Regular memory: Some elements have regular valences, and mastering these rules can help us quickly remember the valency.

For example, alkali metal elements (group 1 elements) typically have a valency of +1 and alkaline earth metal elements (group 2 elements) typically have a valency of +2.

4.Use mnemonics or memory techniques: For elements or valencies that are difficult to remember, you can use mnemonics or memory techniques to associate them with something familiar or interesting to memorize.

For example, denoting the valency of oxygen (O2) as -2 can be associated with two"o", like two eyes looking outward, indicating that it tends to accept two electrons.

5.Do more exercises: Through frequent practice and application, gradually become familiar with valency. You can try to solve some chemical equations or chemical formula practice questions to deepen your understanding and memory of valency.

Memorizing valency takes time and practice, and with consistent learning and practice, you can gradually become familiar with the law of valency and memorize it.

1. Formula one.

Potassium and sodium are judged to be positive for silver and hydrogen, and calcium, magnesium, barium, and zinc are positive for bivalent.

Iron, two, three, copper, one, two, aluminum, four, silicon, two, four carbon.

CFBROMO-iodine nitrogen has a high price, and the elemental zero price will never change.

2, mantra two.

Potassium, sodium, silver, and hydrogen are positive and fluorochlorobromo-iodine is negative monovalent.

Calcium, magnesium, barium, zinc positive bivalent, aluminum positive three (come) oxygen negative two.

Ferrous iron is two iron is three, and copper is one copper is two.

Hydroxide nitric acid is negative monovalent, sulfuric carbonate sulfuric acid is negative bivalent.

Ammonium root is a positive price, don't forget that the element is zero price.

3, formula three.

monovalent potassium hydrochloride sodium silver; Divalent oxygen, calcium, barium, magnesium, zinc.

Three aluminum, four silicon, and five phosphorus, the price change yuan blind sedan car is kept in mind.

Di-triiron, di-tetracarbon, heptachlorine, tri-pentanitrogen.

246 sulfur should be distinguished, and copper and mercury are also available. The elemental element valence is zero.

Negative hydroxide mononitrate, minus dicarbonate sulfate.

Negative three remember the phosphate group, and the positive one is the ammonium root.

4, formula four.

potassium, sodium, silver, and hydrogen are positive monovalent; calcium, magnesium, barium, zinc, positive bivalent;

chlorochlorobromoiodine negative monovalent; Usually oxygen is minus bivalent;

Copper is one and two, and aluminum is three; Iron positive two, three, silicon positive four;

Carbon has positive two and positive four divine changes; Sulfur has minus two, positive, four-six;

minus three plus five nitrogen and phosphorus; Manganese is positive two, four, six, seven.

5, mantra five.

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

Trialuminum, tetrasilicon, phosphorus, di, triiron, and 24 carbon.

246 sulfur is complete, and copper mercury bivalent is the most common.

The zero price of the element should be remembered, and the minus one hydroxide nitrate.

Negative dicarbonate sulfate, negative trivalent is phosphate.

The positive price is ammonium.

Chemical formula: monovalent potassium, sodium, silver chloride, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentavalent phosphorus, ditriiron, ditetraphosphorus, 246 sulfur are complete, and copper and mercury bivalent are the most common. Don't forget that the elemental quality is zero, minus one hydroxide nitrate, minus disulfite carbonate, and one ammonium root in mind.

Other mantras.

Potassium, sodium, silver, hydrogen positive bivalent, calcium, magnesium, barium, zinc positive bivalent, aluminum is positive dioxane negative two, chlorine negative one is the most common, sulfur has negative two positive four six, positive two positive three iron unchanged, positive one two copper two four carbon, elemental zero price will never change, other elements have valence, first dead and then alive to calculate.

Potassium, sodium, silver, hydrogen, ammonium + 1-valent calcium, magnesium, zinc, mercury + 2-valent fluorochlorobromide, iodine, hydroxide, nitrate-1, sulfur oxygen, sulfate, carbonate-2, copper, 12, iron, 23, aluminum, 3, silicon, 4, phosphorus, 5 elemental elements are 0 valence.

It is usually a common valence state for the back.

Some small formulas.

Monovalent potassium hydrochloride sodium silver, (Cl-1 H+1 Na +1 K+1 AG+1) divalent oxygen calcium barium, magnesium zinc, (O-2 Ca+2 Ba+2 mg+2 Zn+2) trialuminum, tetrasilicon, pentavalent phosphorus, (AlCl3 SiO2 P2O5) ditriferric, ditetracarbon, (Feo Fe2O3 Co2) ditetrahexasulfur are complete, (H2S so SO2 SO3) hydrogen monooxane is the standard, (H+1 O-2).

Copper-mercury bivalent is the most common, (CuCl2 HGO).

The unit price is zero. (O2 0 Valence O3 0 Valence mg 0 Valence) compound neutralization is 0 (in the compound, the algebraic sum of the valence of each substance is 0) There are also some classification methods, which you have to learn in high school, this is more. The length is relatively large, if you don't understand it now, it is still recommended to memorize the common price, and talk about it in high school.

Generally, only the first 20 elements are looked at, and you can look at the periodic table.

The first column ia is +1 valence h li na k

The second column IIA is +2 valence and be mg ca BAIIIA is +3 valence.

The most ** and so on, the lowest negative price is just the opposite.

The outermost electrons are generally stable when they are full of 8 and a half 4 or empty.

That's it, just remember that o f doesn't have a positive price and metals don't have a negative price.

This way it will be easy for you to learn the element cycle in high school.

If this is not achieved, look at the number of atoms in the outermost shell, and the outermost shell can form full electrons or empty electrons, and the gain of a few is a negative valence, and the loss of a few is a positive valence.

Generally, there is no negative valence below the outermost 4 electrons

1. Valencies of common elements.

1) Potassium, sodium, silver, hydrogen positive bivalent, calcium, magnesium, barium, zinc;

1. 2 copper, mercury, 23 iron, 3 aluminum, 4 silicon, 5 nitrogen and phosphorus;

246 sulfur 24 carbon, gold positive non-negative elemental zero.

b) monovalent potassium, sodium, silver, hydrofluoride, bivalent calcium, magnesium and barium zinc;

The price of aluminum is positive and negative two, and the above valence states should be remembered;

Copper one or two to iron two three, carbon silicon two or four to be recorded;

Sulfur shows minus 2 plus 46, minus 3 plus 5 nitrogen and phosphorus;

The chlorine price is usually minus one, and there is a positive price of one hundred and fifty-seven;

The regular price of manganese is 246, and the most important number is also seven.

2. Valency of common atomic clusters.

Negative hydroxide mononitrate, negative disulfate carbonate;

Negative three remember the phosphate group, and the positive one is the ammonium root.