The valence table must be suitable for long term memory

Valence is a common formula.

That's what our teachers said.

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.

Potassium, sodium, silver, hydrogen positive one valent, calcium, magnesium, barium, zinc positive bivalent, oxygen is negative two, remember clearly, sulfur has negative two, positive four, six, three aluminum, four silicon, five nitrogen phosphorus, two three iron, two or four carbon, chlorine negative one price is the longest, variable valence is not terrible, the whole judgment is zero, and the zero price of the element will never change.

This is what I found online.

I'm back. Monovalent potassium bichloride, sodium silver, divalent barium oxygen, calcium, magnesium, zinc, trialuminum, tetrasilicon, pentanitrogen, phosphorus, ditriiron, 244 carbon, 2467 manganese, copper and mercury bivalent is the most common, and the elemental valence is zero

Monovalent potassium hydrochloride, sodium silver, divalent magnesium oxide, calcium, copper, zinc, trialuminum, tetrasilicon, pentanitrogen, phosphorus, di-triiron, di-tetracarbon, trialuminum, tetrasulfur, pentavalent phosphorus.

Valency formulas for common elements:

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.

Monovalent potassium bichloride, sodium silver, barium oxygen, calcium, magnesium, zinc, trialuminum, tetrasilicon, pentanitrogen, phosphorus, ditriiron, ditetracarbon, 246 sulfur price is complete.

Copper mercury bivalent is the most common, the valence should be remembered, don't forget that the unit price is zero!

Principles of writing chemical formulas with valency:

Before the positive price, after the negative price; (Gold before and after, oxygen right and not left): al o valence, marked with the head; al o

First slightly simplified, then crossed; al2o3

Algebraic sum, equal to zero. (+3*2)+(2*3)=0 potassium, sodium, hydrogen, silver, positive monovalent, fluorochlorobromo-iodine negative monovalent, calcium, magnesium, zinc, barium positive bivalent, usually oxygen is negative bivalent, aluminum trisilicon, phosphorus pentavalent, iron has positive two and three, carbon has positive two and positive four, copper and mercury positive bivalent is the longest.

Monovalent potassium, sodium, silver chloride, divalent oxygen, calcium, barium, magnesium, zinc, monodica, copper, mercury, 47, manganese, aluminum, silicon, 35 phosphorus.

Ditriiron, ditetracarbon, 246 sulfur and 35 nitrogen.

157 chlorine is often seen, and the zero price of the element will never change.

The valence of the valence is due.

n-monohydrochloride, potassium and silver, n-dimagnesium, calcium, barium and zinc;

The price of aluminum is positive and negative two, and the above prices should be recorded.

Copper-positive one, two, iron, two, three, the highest tetravalent silicon and carbon;

Sulfur shows minus two plus four six, minus three plus five phosphorus and nitrogen;

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

The regular price of manganese is 246, and the highest regular price is also 7.

Common atomic cluster valence.

Negative hydroxide mononitrate, negative disulfate carbonate;

There are also negative triphosphate groups, and only the ammonium root is positive one.

The common valency memory formulas are as follows:

1. Formula 1: Hydrogen, sodium, potassium, silver, positive monovalent, calcium, magnesium, barium, zinc, positive bivalent; Aluminum, trisilicon, tetranitrogen, phosphorus, penta, 246, sulfur, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 6, 24, 24, 24, 24, CFO-iodine is negative monovalent, and oxysulfur is often negative bivalent; Both nitrogen and phosphorus have negative trivalent; The elemental valence is zero.

2. Formula 2: monovalent hydrochloride, potassium, sodium silver, divalent oxygen, calcium barium, magnesium and zinc. Trialuminum, tetrasilicon, phosphorus, di, triiron, and 24 carbon. 246 sulfur is complete, and copper mercury bivalent is the most common. The positive price is ammonium.

3. Formula 3: potassium, sodium, silver, hydrogen is one valent, calcium, magnesium, barium, zinc is two valent; Iron is two three, copper one two, three aluminum, four silicon, two or four carbon; CFBROMO-iodine nitrogen has a high price, and the elemental zero price will never change.

4. Formula 4: monovalent hydrochloride, potassium, sodium silver, divalent oxygen, calcium barium, magnesium and zinc; Trialuminum, tetrasilicon, phosphorus, di, triiron, and 24 carbon. 246 sulfur is complete, and copper mercury bivalent is the most common. Negative dicarbonate sulfate, negative trivalent is phosphate.

5. Valency is the property of an atom of an element when it is atomized with other elements. 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.

Valency formulas are used to learn valency formulas.

Valency is the number of chemical bonds that one atom of an element forms with the atoms of other elements. An atom is made up of the nucleus and the electrons on the periphery, which move in layers, and the atoms of the compound are connected to each other by as many bonding bonds as the valence.

Junior high valence.

Potassium, sodium, silver, hydrogen positive one price, barium zinc, calcium magnesium positive two hidden reputation stall price, one or two copper, two iron, cuprous ferrous 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, two three iron, two or four carbon, elemental zero price will never change.

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

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.

Positive potassium, sodium, silver, hydrogen ammonia, n-dicalcium, copper, magnesium, barium, zinc, aluminum, trisilicon, phosphorus, plus five, chlorine, often negative one, negative two, negative two, iron to two, three, carbon, two, four, sulfur, etc., all are complete.

n-monohydrochloride, potassium, sodium, silver, n-dicalcium, magnesium, barium, zinc, mercury.

Positive trialuminum, negative dioxide. chlorochlorobromoiodine negative monovalent;

Variable price, it's not difficult. It is one sub-copper, and it is two copper.

Positive 2 ferrous iron, positive 3 iron. Negative one hydroxide nitrate, negative virtual bond disulfate carbonate, positive monovalent ammonium.