Some of the electronic ones are used, and some of them are used for x, why

x .All three are common symbols that denote electrons.

The electronic formula can help you analyze the transfer of electrons between the atoms of each element when a chemical formula is formed, and some use x and some use. There are also uses. It is to distinguish which electrons are which atoms, e.g. the electronic formula h x of water

o : xh The electrons outside the hydrogen atom are denoted by x, and the electrons outside the oxygen atom are denoted by x. Another example is the chlorite HCl H X

o :cl。

x is the electron of the hydrogen atomare the electrons of the oxygen atom. is the electron of the chlorine atom.

Halo and x are generally used to share electrons, withIt's something else!

You don't care about them while you're doing them, just draw 8 dots or 8 crosses.

Distinguish between electrons donated by different atoms.

For example, h2o can be written as h x

o: x.h Where. : denotes the electrons provided by o, and x denotes the electrons provided by h.

It can be used both when it is not confusing. Denote.

One. It means the same as an x.

It's just to make people more intuitive to see which atom the electron is lost from and which atom gets the electron.

By custom, in order to describe the process by which multiple atoms form a compound, it is easier to understand that different atoms are represented differently.

Science stipulates that it is relatively simple and quick to visualize electrons and distinguish them, so there is no logical definition of dots and forks.

There is no difference between and ··in the electronic formula, except that the representation method is different, and they are not the electrons of different atoms; But if that's used to represent electric current, it's different, which means going in, and it's going out.

The dots and forks represent electrons from hydrogen atoms and carbon atoms, respectively.

There is no difference between the two, but sometimes two atoms form a bond, and it is just a matter of distinguishing which is the electron of atom A and which is the electron of atom B. The second one is very beautiful, the 400 degree Celsius reaction must be a gas.

(1) The outermost shell of the carbon atom in the methyl group is 7 electrons, and there are 3 carbon-hydrogen bonds in the methyl group, and the electronic formula of the methyl group is: , so the answer is: ; (2) The ethylene molecule contains 4 carbon-hydrogen bonds and 1 carbon-carbon double bond, and the structure of ethylene is simplified

ch2=ch2, so the answer is: ch2=ch2; (3) The essence of the esterification reaction is: acid dehydroxyl alcohol dehydrogenation, formic acid and ethanol reaction to form ethyl formate, the chemical equation of the reaction is:

HCOOH+HOCH2CH3 concentrated sulfuric acid HCOOCH2CH3+H2O, the reaction is esterification reaction, which also belongs to the substitution reaction, so the answer is: HCOOH+HOCH2CH3 concentrated sulfuric acid HCOOCH2CH3+H2O; (4) Benzene is dropped into a mixture of concentrated nitric acid and concentrated sulfuric acid, and reacted at 50 --60 to generate nitrobenzene and water, and the chemical equation of the reaction is, so the answer is: substitution reactions; (5) Acetylene and bromine water press (1:

2) 1,1,2,2,-tetrabromoethane is generated by addition, and the reaction equation is: ch ch+2br2 ch(br2)chbr2, the reaction is an addition reaction, so the answer is: ch ch+2br2 ch(br2)chbr2; Addition reaction

Watt-hour meters are only divided into electronic and mechanical types, and I have never heard of digital types.

There is no difference, because it is more convenient to draw dots than to draw, so draw more dots, or distinguish between electrons of different elements.

X and dot both indicate electrons, you can use either one, as long as you don't mix them, and the mix looks messy, but it's not wrong.

No.

Because X represents the electron that the Cl atom gets from the outside world, so it becomes an ion, -1 valence.

is the outermost electron of itself.

Yes, ions are like that, representing possession and absence.

1. Electronic formula: a chemical-specific diagram that uses · and x to simply describe the outermost electron distribution of some uncomplex molecules in the stable or transitional state. This method has great limitations and can only be used for a small number of main group compounds, and is generally not suitable for special or transition elements.

2. The electron stable structure of middle school stage 8 is only a stage goal of learning, which conflicts greatly with the actual chemical theory, or it is only a one-sided (but correct) expression of the electron distribution of some substances in the stable state.

3. Two electronic formulas of carbon dioxide.

The above one is the electronic formula of carbon dioxide, which is more in line with the principle of lowest energy, and the electrons in the box belong to delocalized electrons, which can form a conjugated construction. There are many substances in chemistry that have conjugated construction, and the conjugated bond of carbon dioxide is a kind of bond, and electrons cannot be directly attributed to any atom, but to molecules. The following one is a "not very correct" electronic formula that is easier for our students who have just learned the knowledge of chemical electronic formula to understand and master.

4. It is inevitable that the update of chemical theories will lead to the mistakes of some old concepts and theories, so learn chemistry with the times.

The one below is the electronic form of CO2, and the one above is supposed to be unadjusted. c 4 outermost electrons and o 6 outermost electrons. When CO2 is formed, two electrons of C and two electrons of O come together to the middle of C and O, forming 2 common electron pairs.

If you count it, there's eight electrons next to each atom in the diagram below, which means it's stable.

The above equation intermediate carbon does not reach 8 electrons stable structure, wrong. There must be a vulture in the double bond.

kWh indicates active power.

kvarh stands for reactive power.

I'm sorry, I don't know, I haven't studied it.