How to memorize the valency of chemical elements is easier

It's junior high school huh maybe not enough.

Potassium, sodium, hydrogen and silver are positive one price.

Calcium, magnesium, shell, zinc, positive bivalent.

Floating chlorinated bromide iodine minus monovalent.

Usually oxygen is minus bivalent.

Copper is one, two is two, and aluminum is three.

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

Carbon has positive two and positive four.

Sulfur has minus two, plus four and plus hexavalent.

Phosphorus positive penta, tungsten positive six elemental elements are zero valent.

Potassium, sodium, hydrogen silver, +1 valence.

Chlorochlorobromoiodine-1 valence.

Calcium, magnesium, barium, zinc +2 valence.

Copper has a +1 +2 price.

Iron has a +2 +3 valence.

Aluminum +3 Silicon +4

In addition, there are variable prices.

Such as carbon, sulfur, phosphorus, chlorine, etc., these valencies can be based on common chemical formulas and common valency chain memory, such as according to the valency of co, co2, and oxygen is -2, and the valency of carbon can be inferred to be +2, +4).

Monosodium potassium, copper, silver, fluorochlorobromo, iodide, hydrood.

Magnesium dioxide, calcium iron, mercury, copper, manganese, zinc.

Ferro-triazal-boron.

Tetracarbon, silicon, tin, lead.

Pentazophosphorus, hexasulfur.

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

Of course, it can be analyzed from the number of electrons in the outermost shell, and it is okay not to remember.

When I was in junior high school, I had a slip of the tongue that went something like this:

Monovalent potassium, sodium, silver chloride, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentavalent phosphorus, ditriiron, ditetracarbon, copper, mercury, bivalent are the most common. (Positive and negative prices are not indicated, note the difference).

This is a method, and junior high school is enough.

In addition, it is possible to determine the common valence state according to the position of the periodic table (the premise will be back), or according to the extranuclear electron configuration.

Potassium, sodium, silver, hydrogen, calcium, magnesium, barium, zinc, aluminum (just remember these 9 words), 1 +2 +3 (remember 123), and you're good to go

Copper +1 + 2 iron + 2 + 3 (regular, no rote memorization) only remember 123

Recite it according to the periodic table position.

(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...

1. The most basic valence is the first step, and it must be mastered.

For example, the following two valency formulas:

Hydrogen, sodium, potassium, silver, positive one valent, calcium, barium, magnesium, zinc, positive bivalent, one or two copper, two three iron, two tetra iron, two tetra carbon, three aluminum, four silicon, three or five phosphorus, and manganese, chloride and nitrogen.

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.

After memorizing the valency formula, you have a certain foundation.

2. First mark the valency of some elements with only one valence, and then further mark the most commonly used valency of a certain element, such as oxygen, whose compound can be negative bivalent or negative monovalent (oxygen is negative monovalent in peroxide), and finally according to the principle of algebraic sum of positive and negative valency algebra zero (note: to bring in the corner mark to calculate), determine the valency of unknown elements or elements with more valence.

For example: the valency of sodium bisulfite is marked: first determine that sodium and hydrogen are positive univalent, oxygen is generally negative bivalent, sulfur has more valence, we can calculate its valency according to the positive and negative valency algebra and zero, let the valency of sulfur be x, then there is 1+1+x+3 (-2)=0, and the solution is:

x=4, i.e., the valency of sulfur is positive tetravalent.

Valence oral decision.

Potassium, sodium, silver, hydrogen positive one valent, calcium, magnesium, barium, zinc positive bivalent, aluminum, trisilicon, tetraoxygen, iron three, carbon, four, the same positive two, copper mercury positive one and positive two, nitrogen positive two, phosphorus positive three, nitrogen and phosphorus positive five and negative three, sulfur positive four, six and negative two, chlorine has a positive valence of one hundred and fifty-seven, fluorochlorochlorobromo, iodine are all negative one, and the price of manganese divided by seven is not single (2, 4, 6 are even).

After giving the formula, if you know the valency of an element, you can multiply its valency by the number of atoms of its molecule. Since the valency of the valency is zero, subtract the previous valency from zero and divide it by the number of atoms in the molecule to obtain the valency of another element.

The valency of the two elements is given, and the least common multiple of the valence is found. Then divide the least common multiple by the valency to find the number of atoms in the molecule.

The valency is expressed in +1, +2, +3, -1, -2 ...... for positive and negative valence0 and so on should be marked directly above the element symbol.

To determine the valency of the elements in a compound, attention should be paid to

1) There are positive and negative valences in the valence;

1) Oxygen is usually -2 valence.

2) Hydrogen usually shows +1 valence.

3) When metallic elements are combined with non-metallic elements, metallic elements show positive valence and non-metallic elements show negative valence.

4) Some elements can show different valencies in different substances.

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

3) 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

The 108 chemical elements table recite the mantra as follows: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 am fluorine, the most vicious, grab an electron and be satisfied;

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, as thick as sulfuric acid in the 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 I am the best at precipitating metals;

I am chlorine, yellow-green, metallic electrons I rob;

I am argon, the living oak mountain is poor, and the neon purple light is unleashed;

I'm potassium, add fire, superoxide to the house;

I am calcium, body love, bones and teeth I am there;

I'm titanium, transition comes, shuttle I come cover;

I'm chromium, hexachrome, and the alcohol comes green when it comes over;

I am manganese, with a lot of valence and heptaoxide ** fierce;

I am iron, with a wide range of uses, and stainless steel calls me Lord;

I am copper, purple and red, and brown and red with nitric acid;

I am arsenic, dark in color, and the trivalent element takes your soul;

I am bromine, volatile and smelly, and the liquid non-gold I come to show;

I am rubidium, alkali metal, dipping water fireworks potassium is not as good;

I am iodine, sublimated smoke, encountering starch blue spots;

I am cesium, golden yellow, into the water ** container broken;

I'm tungsten, high temperature, and other metals whine early;

I am golden, very stable, thrown into the king water shadow invisible;

I am mercury, highly toxic, and liquid metal is my own;

I am uranium, and after enrichment, I am the best at building atomic bombs;

I am gallium, which is easy to melt, and the boiling point is very high and difficult to evaporate;

I am indium, soft as gold, and careful with slight radiation;

I am thallium, can lose hair, poisoned and famous to see Tsinghua;

I am germanium, can be lattice, infrared window can be used as a shell;

I am selenium, tonifying the human body, and there is a mystery in the oral liquid;

I'm lead, I can store electricity, and I can also show up in bullets.

Oxygen, carbon, hydrogen and nitrogen formulas are monovalent potassium, sodium, silver chloride, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentavalent phosphorus, it is not difficult to talk about valence, 23 iron, 24 carbon, sulfur has negative 2 positive 46, copper mercury bivalent is the most common, hydroxide, negative monovalent, ammonium, positive monovalent, nitrate, negative monovalent, sulfate, negative bivalent, carbonate, negative bivalent.

A collection of formulasMantra one

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

Magnesium, calcium, copper, barium, zinc, positive bivalent.

Aluminum has positive three, and iron has positive two and three.

Silicon positive four. Chlorochlorobromoiodine negative monovalent.

Usually oxygen and sulfur are negative bivalent.

Don't forget that everything is zero.

Mantra two

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

Chlorochlorobromoiodine negative monovalent.

Calcium, magnesium, barium, zinc positive bivalent.

Aluminum positive three (come) oxygen negative two.

The second iron is the third iron.

Cuprous is one copper and two.

Hydroxide nitric acid negative monovalent.

Carbonic acid sulfuric acid minus bivalent.

Ammonium is a positive price.

Don't forget that the element is zero.

From "Wuhan University Attached to the Middle Cheng Peng Formula".

Mantra three

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

Three aluminum, four silicon, and pentavalent phosphorus, the valence element 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.

Mantra 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.

Sulfur has minus two, positive, four-six;

minus three plus five nitrogen and phosphorus;

Manganese is positive two, four, six, seven.

The above content refers to Encyclopedia - Valency formula.

Valency formulas for junior high school chemistryMonovalent potassium, sodium, fluorohydrochlorophosyl.

Divalent oxygen, calcium, barium, magnesium, zinc.

3. Aluminum, tetrasilicon, pentavalent phosphorus.

Two or three iron, two or four carbon.

Two, four, and six sulfur are complete.

Copper-mercury bivalent is the most common.

The chemical valence of junior high school is smooth.

monovalent chlorochlorobromoiodide; There is also the metal potassium, sodium silver.

divalent barium oxygen, calcium, magnesium, zinc; Aluminum, three silicon, and four are fixed.

The price of chlorine and nitrogen should be noted to Lu Yi; One or two copper, mercury, one or three gold.

Tetracarbon, lead, and triiron; 246 sulfur 35 phosphorus.

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.

A collection of formulas1) Potassium, sodium, silver, hydrogen positive bivalent, calcium, magnesium, barium, zinc positive bivalent.

2) Chlorochlorobromoiodine is negative monovalent, usually oxygen is negative bivalent.

3) Copper is 12, aluminum is 3, iron is 23, silicon is 4.

4) Carbon has positive two and positive four, and sulfur has negative two plus four six.

5) minus three plus five nitrogen and phosphorus, manganese is plus two, four, six seven.

Junior high school chemistry and fighting.

1) Potassium, sodium, silver, hydrogen, positive monovalent, calcium, magnesium, barium, zinc, positive bivalent, mono-2 copper, 2-triiron.

2) Aluminum is minus two of positive trioxygen, chlorine is the most common of minus one, sulfur is minus two plus four hexa, and positive two plus three iron are variable.

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

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

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

6) 246 sulfur iron 23, copper mercury 12 is the price change, 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, plus penta, chlorine, often negative one, oxygen and minus two.

8) Iron to 23 carbon 24, hydroxide nitrate minus one, carbonate sulfate minus two, 246 sulfur are complete.

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

10) Chlorochlorobromo-iodine negative monovalent, variable valence.

11) Positive one sub-copper, positive two copper, positive two ferrous metal, positive triiron.

12) Negative monohydroxide nitrate, negative disulfate carbonate, positive monovalent ammonium, monovalent hydrochloride, sodium chloride, potassium silver.

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