Can anyone help me find the valency and chemical formula of junior 3 chemistry?

For this question, I estimate that it is difficult to say whether anyone will do it with a reward of 100 points.

There is no detailed explanation, only the entire chemical equation.

One-to-one correspondence.

Chlorite (CLO2-), perchlorate (CLO4-), sulfite (SO3-) [all -1 valence]. Potassium nitrate KNO3, silver nitrate AGno3, magnesium nitrate MG(NO3)2, copper nitrate GU(NO3)2, calcium nitrate GA(NO3)2, ferrous nitrate Fe(NO3)2, ferric nitrate FE(NO3)3, sodium carbonate NaCO3, potassium carbonate K2CO3, magnesium carbonate MGC3, calcium carbonate GAC3, barium carbonate BAC3, potassium sulfide K2S, sodium sulfide Na2S, zinc sulfide ZNS, aluminum sulfide Al2S3, sodium phosphate NaPO4, Calcium phosphate GA (PO4) 2, potassium hydroxide KOH, magnesium hydroxide MG (OH) 2, calcium hydroxide GA (OH) 2, barium hydroxide BA (OH) 2, aluminum hydroxide AL (OH) 3, iron hydroxide Fe (OH) 3, ferrous hydroxide FE (OH) 2, copper hydroxide GU (OH) 2, cuprous hydroxide guoh, potassium chlorate KCLO3, calcium chlorate GACLO3, potassium manganate KMno3, potassium permanganate KMno4, sodium permanganate NAMNO4, Sodium sulfite Na2SO3, sodium nitrite Na2, ammonium chloride NH4Cl

Tell me the formula, memorize it, these things can be matched by yourself.

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

Calcium, magnesium, barium, zinc is positive bivalent, and oxygen is usually negative bivalent.

Iron 23, carbon 24, aluminum, silicon, 4, phosphorus and 5 valent, don't forget that the element is zero price.

Hydrogen and oxygen are negative monovalent, nitrate is negative bivalent, sulfate is negative bivalent, and carbonate is negative bivalent.

Generally left like this.

For example: Iron hydroxide Fe(OH)3 hydroxide is negative monovalent, and it is iron so iron is trivalent. If it is ferrous steel, then the iron is bivalent.

Ammonium is +1 valence and nitrate is -1 valence, this compound is an ionic compound, but there is a covalent bond between nitrogen and hydrogen in ammonium, and there is also a covalent bond between nitrogen and oxygen in nitrate.

Actually, I don't know what you're going to ask, it's too confusing.

Valency, that is, the property of a certain number of atoms of an element and a certain number of other elements, is called the valency of an element. It is an important property of the element.

Calculation according to the valence should be observed"The sum of the valencies of the elements is equal to zero".For example, in BaCl2, the valency of Ba is +2 valence, and Cl is generally -1 in the compound

valence, according to the addition of valence equal to zero, the formula can be listed: 2*1+(-1x)=0.Find x=2(Note: You can calculate directly orally when you usually calculate, so you don't have to be so troublesome).

Remember: the valency of a single element is zero.

Writing the correct chemical formula is also calculated according to the valence, but the reverse calculation is just the opposite, and the same is observed"The sum of the valencies of the elements is equal to zero".

Valence formula.

Hydrogen +1, Oxygen-2, Silver, Lithium, Sodium, Potassium +L, Zinc, Magnesium, Calcium, Barium +2, Aluminum +3, Silicon +4

Only metal or hydrogen, nitrogen, phosphorus-3, sulfur-2, chlorochlorobromide-iodine total -1

Variable price, not terrible, specific judgment"and zero".

If the element is zero, it should be remembered.

A chemical formula is a formula that uses element symbols to represent the composition of matter, and the sum of the relative atomic masses of each atom in the chemical formula is the quantity of the formula.

According to the valency, write the chemical formula: The cross method is used to write the chemical formula according to the valency, before the metal, after the non-metal, and after the oxygen in the oxide. For example, the chemical formula of alumina is written: , before the metal, after the non-metal, and after the oxygen in the oxide, write: al

o；Mark the valency directly above the element symbol, and write 2 in the lower right corner of al and 3 in the lower right corner of o

3-2alo

The chemical formula is: Al2O3; Check the correctness or falsehood of the chemical formula according to the "algebraic sum of the positive and negative valencies of each element in the chemical formula is zero": (+3) 2+( 2) 3 0.

Such a correct chemical formula is written in the criss-cross method.