Valency formulas that can be used in junior high school, valency formulas in junior high school?

Monovalent potassium, sodium, hydrogen and silver, bivalent calcium, magnesium, barium and zinc, trialuminum, silicon, pentavalent phosphorus, 12 copper, 23 iron, 246 sulfur are complete, 35 phosphorus, 2445 is elemental nitrogen, 2467 manganese is special, copper mercury bivalent is the most common. Metals generally show positive prices, non-metals generally show negative prices, chlorine and oxygen elements are negative prices, and others are positive prices.

potassium, sodium, silver, hydrogen positive monovalent, fluorochlorobromo-iodine negative monovalent; Magnesium, calcium, zinc, barium positive bivalent, usually oxygen is negative bivalent; Nitrogen plus or minus 3245, sulfur has minus 2 plus 46, 23 iron, 24 carbon, 3 aluminum, 4 silicon, 5 valent phosphorus; 157 valence element chlorine, 246 sulfur manganese 47; Copper-mercury bivalent is the most common, with zero elemental valence.

Valence is not difficult to remember; sodium hydrochloride, potassium bromide; Copper and oxygen are all bivalent: nitrogen and aluminum; silicon-manganese-four; Pentavalent is one more phosphorus tungsten. Copper is positive one two, iron is two three, carbon two four, and sulfur energy becomes negative two plus four six. Metals are positive, non-metals are negative, and oxygen is positive.

Monovalent hydrochloride, potassium, sodium silver, divalent oxygen, calcium, magnesium, barium, zinc, trialuminum, tetrasilicon, pentavalent phosphorus, di-triiron, ditetracarbon, 246 sulfur are complete, tetra7 manganese, tri-pentanitrogen, copper mercury bivalent is the most common...

Note: Gases are all negative, and metals are positive.

Monovalent: potassium, sodium, chloride, hydrogen, phosphorus.

Divalent oxygen, calcium, barium, magnesium, silver.

Trialuminum, tetrasilicon, pentavalent phosphorus.

Di- and tri-iron and two-tetra-carbon.

Two, four, and six sulfur are complete.

Copper-mercury bivalent is the most common.

Don't forget that the quality is zero.

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.

Valence 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.

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.

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 price of the monoquality cover is zero.

Negative mononitrate hydroxide, divalent sulfur is good acid carbonate, negative trivalent is phosphate, positive monovalent is ammonium. Note: The sum of the valence algebraic chains 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.

The valence formula for junior high school valence is as follows:Potassium, sodium, silver, hydrogen are monovalent, calcium, magnesium, barium, and zinc are bivalent.

One or two copper, two or three iron.

Aluminum is positive trioxygen minus two, and chlorine is negative one is the most common.

Sulfur has negative two plus four six, plus two plus three iron variable.

N-tetrasilicon, tetra-carbon, zero price of the unit will never change.

Negative hydroxide mononitrate, negative dust finch disulfate carbonate.

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

Other elements have a price change early, first dead and then alive to calculate.

How to write valence:1) In compounds, the valency of the elements is specified early according to the positive and negative valency algebra and the calculation of zero.

2) Clearly mark the valency of the element directly above the element, and all positive and negative signs are marked.

3) When the aerobic element appears, the oxygen element is written on the back.

4) In compounds composed of metals and non-metals, when writing the chemical formula, the elemental symbols of metallic elements are written in front and the elemental symbols of non-metallic elements are written in the back.