Can you explain the concept of valence, which is easier to understand?

Hello landlord! In fact, the encyclopedia is very detailed, so I'll simplify it a little.

All atoms have a nucleus and an extranuclear electron, and correspondingly, each atom has a different ability to attract electrons. For example, oxygen is generally negative because it has a stronger electronic ability than the atom he is partnered with, so he himself has a negative valence, and the other one has to have a positive valence. We call this ability to gain electrons "electronegativity."

The more electronegative the atom, the stronger the ability to attract electrons.

Good! On this basis, we know that atoms are bound to bond with each other. If the bonding atoms are different, then the electronegativity of the two bonded atoms is different (more precisely, it is generally different), then the electron must be biased, and the electron is biased towards the atom with greater electronegativity, then this atom is correspondingly negatively charged, that is, the apparent (-1) valence, and the other is the apparent (+1) valence.

For example, the oxygen atom in water H2O, because oxygen and two hydrogen are bonded, and both pairs of electrons are biased towards oxygen, so oxygen shows (-1) + (1) = (-2) valence. So, what if the two atoms that form a bond have the same electronegativity? - Then the electrons are not biased!

Both of them have zero eggs!

The above is the valency in the standard sense, as for the kind of oxygen in junior high school, it must be negative bivalent or something, but the apparent valency, such as what is the price of CR in CRO5? The junior high school must say that it is +10 valence, in fact, in the standard sense of the chemical valence, CR is +6 valence, of which one O is -2 valence, and the rest is -1 valence.

Hehe, does the landlord understand? Sorry, but it's a bit of a hassle. But this is already very simple, and if it involves the coordination key or something, it is even more troublesome.

I don't know if the landlord understands, if you don't understand, listen to other people, or work hard, go and see the encyclopedia!

Isn't there an encyclopedia? That's detailed.

Valence is the property of an element that manifests itself when one atom is atomized with other elements.

Generally, the valence number 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.

1. Valency indicates the number of electrons gained and lost by atoms when they are combined with each other.

2. Valency is also a property exhibited by elements in the formation of compounds.

The textbook definition is "the number of atoms that combine with each other". For example: the valency of sodium is +1 and the common valency of chlorine is -1, so there is one sodium ion and one chloride ion in one NaCl because the algebraic sum of the valency of the compound is zero.

That is, 1+(-1)=0. The valency of oxygen is -2, so sodium oxide should be written as Na2O

Valency is when the elements are combined with each other, and the ratio of the number of reactant atoms is always constant. And since atoms are the smallest particles that cannot be separated in a chemical reaction, when the elements are combined with each other to form a certain compound, there must be a certain simple integer ratio between the number of electrons outside the nucleus that changes between the elements.

Definition: Valency is the number of electrons gained or lost by atoms in a substance or the number of shifts in shared electron pairs.

Valency indicates the number of electrons gained and lost by atoms when they are combined with each other.

Valency is also a property exhibited by an element or root in the formation of a compound.

The "valency" of an element is an important property of an element, which is only manifested when it is combined with other elements. That is to say, when an element exists in a free state, that is, when it does not combine with other elements to form a compound, the element does not exhibit its valency, so the valency of the element in the element is "0". For example, zn, c, h2, etc.

1. In layman's terms: valence.

It is the ability of atoms of an element to be atomized and simplified with other elements. For example, h=1;o=2；n=3……

2. Valency is essentially the number of electrons gained or lost by the atoms of an element; Or the number of electrons provided when an electron pair is formed. For example, if na loses an electron in the reaction, his valency is 1; o In the reaction two electrons are obtained, and his valency is 2; Or if the target type n donates 3 electrons to form three electron pairs in the reaction, his valency is 3....^

3. However, the valence is positive and negative. The electrons are negatively charged, and the obtained electrons (or electron pair bias) show negative valency, and the loss of electrons (or electron pair deviation) shows positive valency. For example, in the H2O molecule, O and 2 H atoms form an electron pair, and the ability of O to attract electrons is stronger than H, and the electron pairs are biased towards O, so the valency of O is -2; The valency of h is +1

4. In a substance, the algebraic sum of positive and negative valency is equal to 0. For example, in water molecules.

Medium 1x2-2=0

5. We set the valency of the element to 0.

Remember and the first price, it is not easy to answer the question, I hope our labor can be recognized, which is also the motivation for us to continue to move forward!

Valency is the number of electrons gained or lost by atoms in a substance, or the number of shifts in shared electron pairs.

Significance: Valency indicates the number of electrons gained and lost by atoms when they are combined with each other; Valency is also a property exhibited by an element or root in the formation of a compound.

The property of a certain number of atoms of an element that is combined with a certain number of atoms of other elements is called valence。Valency is a property of an element.

The valence of valence 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 can be achieved by the subouter shell.

Writing of valence1. In compounds, the valency of the specified element is calculated according to the algebra of positive and negative valency and 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 chemical formulas, the element symbols of metal elements are written in the front, and the element symbols of non-metallic elements are written in the back.