Elemental valence, how to calculate elemental valence

Valence tables of common elements and atomic clusters.

1 valence: potassium (k) sodium (na) silver (ag) hydrogen (h) ammonium (NH4) 2 valence: copper (Cu) barium (Ba) mercury (Hg) magnesium (mg) calcium (Ca) zinc (Zn) ferrous (Fe).

3 price: aluminum (Al) iron (Fe).

0 valence: the valence of the elements in the element.

1 valent: fluorine (f) chlorine (cl) bromine (br) iodine (i) hydroxide (oh) nitrate (NO3).

2 valence: oxygen (O) sulfur (S) sulfate (SO4) carbonate (CO3) 3 valence: phosphate (PO4).

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The valency of the element is not the periodic table of the elements at the back of the chemistry book, and the valency is not seen on it, but there are a few that are special, such as fe, so it is necessary to rely on the usual accumulation, and pay attention to the basic things to introduce the valency yourself.

It depends on what the compound is! The valency of the main group in the periodic table of the elements is generally unchanged.

The general law of elemental valence.

One of the general laws of elemental valence.

Among compounds, oxygen usually shows -2 valence, and hydrogen usually shows +1 valence; 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).In a compound, the algebraic sum of positive and negative valencies is zero.

The atoms of many elements can gain and lose different numbers of electrons (or form common electron pairs) under different conditions, thus showing variable valency. For example, iron can show +2, +3 valence, sulfur can show -2, +4, +6 valence, etc.

The valency of an element is a property that manifests itself in the formation of a compound, so in an elemental molecule, the valency of an element is zero.

The second general law of elemental valence.

1) The valency of hydrogen is usually +1 valence, and oxygen is -2 valence.

For example: ,,, the valency of hydrogen is +1 valence, and the valency of oxygen is -2 valence.

2) The valency of the metal element is normal.

For example, the valency of magnesium is +2, zinc is +2, and aluminum is +3.

3) When a non-metal is combined with hydrogen or a metal, the non-metal has a negative valence; When non-metals are combined with oxygen elements, non-metals show positive valence.

For example, in , the valency of sulfur is -2, the valency of chlorine is -1, and the valency of phosphorus is +5.

4) Under different conditions, the atoms of some non-metallic elements can either gain electrons (or share electron pair bias) and show positive valence, or lose electrons (or share electron pair deviation) and show positive valence.

For example:,,5) The number of electrons lost (or the common electron pair deviates) of the atoms of certain metallic elements is different under different conditions, so these metallic elements show different valencies in different compounds.

For example: iron, copper have valence, 6) the valency of the element is a property exhibited in the formation of compounds, in the elemental element the valency of the element is zero.

1 valence: potassium (k) sodium (na) chloride (cl) silver (ag) hydrogen (h) ammonium (NH4) 2 valence: oxygen (O) barium (Ba) mercury (Hg) magnesium (mg) calcium (ca) zinc (Zn) ferrous (Fe).

3 price: aluminum (Al) iron (Fe).

0 valence: the valence of the elements in the element.

1 valent: fluorine (f) chlorine (cl) bromine (br) iodine (i) hydroxide (oh) nitrate (NO3).

2 valence: oxygen (O) sulfur (S) sulfate (SO4) carbonate (CO3) 3 valence: phosphate (PO4).

The most basic valence will be memorized; The valency of some elements with only one valency is marked first, and then the valency of a certain element is further marked. Finally, according to the principle of the algebra sum of positive and negative valency algebra to zero (note: to bring in the corner mark to calculate), the valency of unknown elements or elements with more valency is determined.

Monovalent CFBROMO, hydroiodine, and potassium, sodium, and silver.

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

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

Tetracarbon, lead, triiron, 246, sulfur, and 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.