Is there a trick on the chemical formula of the first 3 chemistry, the valency back?

Positive price: potassium, sodium, hydrogen, silver, positive price, calcium, magnesium, barium, zinc, positive bivalent, copper, positive 12, aluminum, positive 3, iron, positive 23, silicon positive 4. Negative price:

Chlorochlorobromo-iodine minus monovalent, oxysulfur minus diphosphorus tri. Valency of atomic clusters: one negative mononitrate hydroxide, negative disulfate carbonate, and negative triphosphate, only positive one is ammonium.

It's really not a trick!

Monovalent sodium hydrochloride potassium silver.

Divalent oxygen, calcium, barium, magnesium, zinc.

3. Aluminum, tetrasilicon, pentavalent phosphorus.

Two-three-iron-two-tetracarbon.

Two, four, and six sulfur are all complete, memorize it! After memorizing it, you can push some chemical formulas.

For example, silver chloride is AGCLMagnesium chloride is MgCl2

For example, there is a mantra:

monovalent potassium, sodium, silver chloride, hydrogen (chlorine is negative monovalent);

bivalent calcium, magnesium, barium oxygen, zinc (oxygen is negative bivalent);

3. Aluminum, tetrasilicon, pentavalent phosphorus.

23 iron, 24 carbon, 24 sulfur are complete;

Copper-mercury bivalent is the most common.

If you memorize the mantra well, your grades will naturally be high!

Potassium, sodium, silver, and hydrogen are positive monovalent.

Calcium, magnesium, barium, zinc positive bivalent.

Chlorochlorobromoiodine negative monovalent.

Oxygen is usually minus bivalent.

246 sulfur 24 carbon .

Copper is one and two and aluminum is three.

Iron is two, three is silicon, and four is silicon.

Negative monohydroxide nitrate.

Negative disulfate carbonate.

The positive price is ammonium.

But in fact, many elements have n multivalent states, and you will know it later, and it's OK to memorize these in the third year of junior high school.

If you go to the Internet to look up the "chemical version of blue and white porcelain" and can sing, you won't have to worry about junior high school mathematics, there is a formula:

monovalent potassium, sodium, silver chloride, hydrogen (chlorine is negative monovalent);

bivalent calcium, magnesium, barium oxygen, zinc (oxygen is negative bivalent);

3. Aluminum, tetrasilicon, pentavalent phosphorus.

23 iron, 24 carbon, 24 sulfur are complete;

Copper-mercury bivalent is the most common.

Or for example, p+o2=p2o5 p2 can see that o is +2 valence, and o5 can see p is +5 valence.

Keep in mind the general valency. Then the sum of the valencies of the compounds and so on is calculated with zero, and the unknown is calculated.

1.Potassium, sodium, silver, hydrogen positive monovalent, calcium, magnesium, zinc positive bivalent, monodica, copper and triferroAluminum is minus two of the positive trioxana, chlorine is the most common of minus one, sulfur has minus two plus four hexa, and the plus two plus three ferroferros are variable 3

N-tetrasilicon, ditetracarbon, elemental zero price forever, minus nitrate reflux hydroxide, minus disulfate carbonate 4Remember the phosphate group, the positive one is ammonium, and the other elements have valence, and they die first and then live to calculate 5Monovalent potassium chloride, sodium silver, divalent oxygen, calcium magnesium, zinc.

Tri-aluminum, tetrasilicon, pentavalent phosphorus, ditetracarbon, tri-pentanitrogen 6246 iron sulfur 23, copper mercury 12 is a variable price, the element is zero do not need to be counted 7Positive potassium, sodium, silver, hydrogen ammonia, n-dicalcium, copper, magnesium, zinc, aluminum, trisilicon, phosphorus, plus penta, chlorine, often negative one, oxygen minus 2

Iron to two three carbon two judgment only hunger four, hydroxide nitrate minus one, carbonate sulfate slag minus two, 246 sulfur are complete 9N-monohydrochloride, potassium, sodium, silver, n-dicalcium, magnesium, zinc, mercury. Positive three aluminum, negative dioxide 10

Positive 1 sub-copper, positive 2 copper, positive 2 sub-iron, positive 3 iron 11Negative monohydroxide nitrate, negative disulfate carbonate, positive monovalent ammonium, monovalent sodium hydrochloride potassium silver (divalent magnesium oxyoxide, calcium zinc, trivalent elements uranium, aluminum sulfa, tetravalent carbonic acid, pentavalent phosphorus).

The third year of junior high school chemical valency recite the mantra as follows:

Monovalent chlorochlorobromoiodide, hydrood, and potassium and sodium silver.

Divalent barium oxygen, calcium, magnesium, zinc, aluminum, trisilicon, and tetra are fixed.

It is necessary to pay attention to the price change of chlorine and nitrogen, one or two copper, mercury and three gold.

Ditetracarbon, lead, ditriiron, 246, sulfur, tri-phosphorus.

2.The main valence 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.

The third is the aluminum bureau Kaichun is 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.

3.Valence formula three.

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 is most commonly bivalent.

4.Common root price formulas.

monovalent ammonium root, sunta nitrate; Hydrohalide hydroxide.

permanganate chlorate; Perchlorate acetate.

divalent carbonate sulfate; Manganese hydrosulfate.

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

Benefits of Studying Chemistry:

1. Ensure the survival of human beings and continuously improve the quality of human life, such as the use of chemistry to produce chemical fertilizers and pesticides to increase food production, the use of chemistry to develop new energy and new materials, the use of chemistry to comprehensively apply natural resources and protect the environment, so as to make human life better.

2. Chemistry is a practical discipline, and mathematics and physics have become the foundation for the rapid development of natural science, and the core knowledge of chemistry has been applied to all areas of natural science, and chemistry is an important pillar of the powerful force of creating and transforming nature.

3. The intersection and penetration of chemistry and other disciplines have produced many marginal disciplines, such as biochemistry, geochemistry and atmospheric chemistry, which have led to the rapid development of science and technology such as biology, electronics, aeronautics, lasers, geology and oceanography.

Monovalent potassium, sodium, silver hydrochloride, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, and pentavalent phosphorus It is not difficult to talk about price change.

Ditrifer, Ditetracarbon, Sulfur has minus two, plus four, hexa, copper mercury bivalent is the most common, hydroxide, minus monovalent.

Ammonium positive monovalent nitrate negative monovalent sulfate negative bivalent carbonate negative bivalent.

1.Use the formula method to memorize the valency of chemical elements

1) Regular price:

monovalent potassium hydrochloride sodium silver;

Divalent oxygen, calcium, barium, magnesium, zinc.

3. Aluminum, 4 silicon, 5 nitrogen and phosphorus. 

2) Variable price:

Copper one two, iron two three,

Bis. (minus) tetrahexasulfur ditetracarbon,

Two, four, six, seven, manganese are all occupied. 

3) Negative price:

Negative monofluorochloride and bromoiodine,

Negative dioxysulfur and negative trinitrogen.

2.Valency formula:

Potassium, sodium, hydrogen, silver, positive bivalent, calcium, magnesium, zinc, barium, positive bivalent, fluorochlorobromo, iodine negative bivalent, usually oxygen is negative bivalent, copper is positive 12, aluminum is positive, iron has positive 2 and positive, carbon has positive 2 and positive4, sulfur has negative 2, positive, 46.

3.Common elemental valency formulas, and atomic cluster valency.

K na ag h +1 valence.

CA ZN BA MG HG +2 valence.

CU has +1, +2 valence, FE has +2, +3 valence.

Remember that AL is +3 valence.

F and Cl 1 valence O and S are 2 valence.

OH root, root 1 valence.

Potassium monohydrogen and silver sodium. N-dicalcium magnesium and barium zinc, oxygen is minus two aluminum plus three, the element valence of the element is zero, cuprous is positive one copper positive two, ferrous positive two iron is three, the total price is zero when the law is the law, and the rest of the price loss can be calculated!!

With this, all of them are good - Actually, just memorize the first two sentences and you can do the question!

N-monohydro, potassium, sodium silver.

Calcium, magnesium, barium, zinc, positive two flat.

Potassium monohydrochloride, sodium silver, boiling bromide, iodine.

Negative barium oxide, calcium, magnesium, zinc.

3. Aluminum, tetrasilicon, pentavalent phosphorus.

Two-three-iron-two-tetracarbon.

Two, three, four, five is nitrogen.

Two, four, and six sulfur are complete.

Four, five, six, seven are fierce and difficult to distinguish.

The bivalent of copper is the most common, and the valence should be remembered, and the elemental quality should be 0

Potassium, sodium, silver, hydrogen positive one valent, calcium magnesium, barium zinc positive two valent, aluminum positive three, oxygen negative two, sulfur negative two positive four-six, iron +1 valence, high school still to learn.

Back formula: "Monovalent potassium, sodium, ammonia, silver, hydrogen, bivalent barium, magnesium, calcium and zinc, trivalent aluminum, tetravalent silicon, tri- and pentaphosphorus, copper is."

One, two, iron.

II.III. Negative hydroxide, nitrate, negative dicarbonate, sulfate. Only minus triphosphate".

First of all, you need to memorize the valency formula, secondly, you need to know that a molecule does not show an electric charge to the outside, so the sum of the valency of all atoms in this molecule is 0 (if it is an ion cluster, it needs to be judged according to the title), pay attention to the corner code in the lower right corner of each symbol should also be considered, it represents how many of the atoms in the molecule, and the angle code needs to be multiplied by the valency when adding. In addition, as for writing the chemical formula of a substance, you can reduce the valency of each atom to a proportional form and write it in the lower right corner of the other party. For example, ca(+2 valence) cl (minus 1 valence) is written as cacl2.

The study of valency is a very important point in junior high school, throughout the beginning and end of learning, you can first remember the valency of some common elements from the atom gain and loss of electrons, of course, this is just the basic, and then it is necessary to memorize the valency formula: monovalent chloride, potassium, potassium, sodium, silver, barium oxygen, magnesium, zinc, aluminum, silicon, phosphorus, phosphorus, 23iron, 24 carbon, 246 sulfur are complete, copper and mercury bivalent are the most common, don't forget that the elemental matter is zero. Then there is the calculation of valence, one of the tricks is that the valency of the element you calculate must be different from the valency you remember, and you can only get it through calculation.

If you do too many questions, you will naturally be, but at the beginning, you have to memorize the formula, mark the valency of commonly used elements when doing the problem, and then calculate the valency that you are not familiar with according to the principle that the valency of the compound is 0, which is actually a number; It's good to be familiar, I'm in college now, I haven't studied chemistry for a long time, and I don't remember it very clearly, but general substances can be written directly with chemical formulas!

The valency is still very simple, first of all, the valency formula should be remembered, and secondly, in junior high school chemistry, the valency of most pure substances except organic matter is 0, so calculate the valency of each element to see how to make their final valency 0 in proportion, just like that, it's very simple.

All you have to do is remember the valencies of a few common substances. Most of the non-metallic elements have negative valence, such as: nitrogen has -3 valence, silicon has -4 valence...

Chemistry in junior high school is the foundation, or you will be directly over in high school, you should memorize all the memorization, chemical formulas are familiar, as long as you learn a little bit of valency, all problems will be solved.

For example, monovalent hydrochloride, potassium, sodium silver, just remember that chlorine is negative, and the valency of the compound is zero, just remember that.

If you want to memorize the valence formula, as long as you grasp the valence rule, that is, the sum of the valence is 0, and you should have no problem.

Dear, tell a mantra:

Monovalent potassium, sodium, silver chloride, divalent oxygen, calcium, barium, magnesium, zinc. Tri-aluminum, tetrasilicon, pentavalent phosphorus, di-triiron, ditetracarbon, 246 sulfur prices are complete. Copper and mercury bivalent is the most common, metals are positive and negative, and don't forget that the unit price is zero.

Monovalent potassium bichloride, sodium silver, barium oxygen, calcium, magnesium, zinc, trialuminum, tetrasilicon, pentanitrogen, phosphorus, ditriiron, ditetracarbon, and ditetrasulfur are complete, and copper and mercury are the most common. The elemental valency is 0, and the metal element is absolutely normal, and it can also be calculated that the valency of an element is generally one, and there are 2 kinds of parts, especially many kinds. The valency is generally related to the number of electrons in the outermost shell, and it is generally possible to calculate the spur of some elements with multiple valencies in the substance.

They have to achieve a stable structure, hand hit, thank you for adopting.

The valence list is not difficult to memorize (there should be a formula), and the determined valency is first dropped out in the question, such as oxygen, potassium and sodium.

Then the positive and negative valence equalization will be on the line, it will not be difficult, but if it doesn't work, it will be one generation after another.

There is also the need to memorize chemical equations (it's still a long time, there's still a semester, enough time).

When finding valency, you first find the element with non-changing valency, mark its valency directly above the element symbol, and then find the valency of the element to be found according to the principle of algebraic sum of positive and negative valency in the compound. For example, find the valency of chlorine in KCLO3. First, mark the valency of potassium and oxygen.

Let the valency of chlorine be x, and the equation +1+x+(-2)*3=0 is obtained, and x=+5 is obtained

Did you slip through the cracks on your back? What potassium, sodium, silver, hydrogen positive bivalent, calcium, magnesium, barium, zinc positive bivalent; Aluminum is positive trioxygen-di, chlorine minus monovalent is the most common; Sulfur has minus two plus four six, plus two plus three iron variable; positive one, two, copper, two four, and the zero price of the element will never change; Other elements have valence, which is calculated by dying first and then living. The valence should be accurate, monovalent potassium, sodium, silver chloride, divalent oxygen, calcium barium, magnesium, zinc, trisilicon, tetraaluminum, and pentavalent phosphorus; It is not difficult to talk about price change, 23 iron, 24 carbon, 246 sulfur are complete, and copper mercury bivalent is the most common.

For example, the number of outermost electrons is 6, and it is closer to 8, which is negative two, which is 3, and closer to 0, which is positive three.

And it can't be crossed, only once, for example, if there is an element with three valence states of 1, 0, 5, it can only be 1 to 0, 0 to 5, and 5 can not be to 1.

Very simple! I'm graduating too, buddy to teach you a few tricks:

Look at the valency as a number, for example, hydrogen is +1, oxygen is -2, etc.

Remember that the valency of the compounds adds up to 0, e.g. there are two hydrogen and one oxygen in water, -2+1*2=0. To find which one, use zero to subtract (for example, if you are told that the hydrogenation valency is +1 to find the oxidation valency in water, use 0-1*2 to get -2.) Anyway, the valency of an element in a molecule is constant, just subtract it.

The valency of the elemental compounds adds up to 0.

The valency of elements in different substances may be different, such as "two or three irons" in the formula, that is, the valency of iron is bivalent or trivalent.

Try to memorize the mantra and memorize the commonly used valencies I have been using this method, and it is very easy to use.