What is the meaning of that arrangement of the periodic table?

The more to the right the main group elements, the stronger the non-metallic and the more upward the metallicity.

With the increase of the number of periods, the molecular weight of the elements of the same main group increases, the radius becomes larger and larger, and the metallicity becomes stronger and stronger.

With the increase of the number of atomic coefficients, the molecular weight of the same periodic element increases, the radius becomes smaller and smaller, and the non-metallicity becomes stronger and stronger.

The last column is full of noble gases, which are chemically stable.

According to the difference in the number of elements contained in each cycle, the first cycle with only 2 kinds of elements and the cycle with 8 kinds of elements each is named "short period", and the cycle is named "long period", wherein the cycle has 18 kinds of elements each, the 6th cycle has 32 kinds of elements, and the 7th cycle has 26 kinds of elements, because the seventh cycle is not yet filled, so it is also called "incomplete cycle" ("incomplete cycle").

1 The law of gradual degeneration of elements and their compounds in the periodic table.

Atomic radius. 1) The atomic radius of the periodic elements (except the noble gas elements) decreases with the increasing atomic number, except for the first period;

2) The atomic radius of elements of the same group increases from top to bottom as the number of electron layers increases.

Elemental valence.

1) Except for the first period, from left to right in the same period, the highest positive valence of elements increases from alkali metal +1 to +7, and the negative valence of non-metallic elements increases from carbon group -4 to -1 (except for fluorine without positive valence and oxygen without +6 valence);

2) The highest positive and negative values of elements in the same main family are the same.

The melting point of an element.

1) With the increase of atomic number of elements in the same period, the melting point of the elemental element increases, and the melting point of the non-metallic element decreases.

2) From top to bottom, the melting point of the elemental metal element decreases, and the melting point of the non-metallic elemental increases.

The metallicity and non-metallic properties of the elements.

1) The metallicity of elements in the same period decreases from left to right, and the non-metallicity increases;

2) The metallicity of elements in the same main group increases from top to bottom, and the non-metallicity decreases.

The most ** acidity and alkalinity of oxides and hydrates.

The stronger the metallicity of the element, the stronger the alkalinity of the hydrate of its most ** oxide; The stronger the non-metallic nature of the element, the more acidic the hydrate of the most ** oxide.

Non-metallic gaseous hydrides.

The stronger the element non-metallic, the more stable the gaseous hydride. The stronger the non-metallic nature of the non-metallic elements in the same period, the more acidic the gaseous hydride aqueous solution is. The stronger the non-metallic nature of the non-metallic elements of the same main group, the weaker the acidity of the gaseous hydride aqueous solution.

Oxidation and reduction of elemental matter.

The stronger the metallicity of the general element, the stronger the reduction of its element, and the weaker the oxidation of oxygen ions of its oxides. The stronger the non-metallic nature of the element, the stronger the oxidation of its elemental substances, and the weaker the reducibility of its simple anions.

2.Inferring the regularity of the position of an element.

The law that should be kept in mind to determine the position of an element in the periodic table:

1) The number of periodic elements is equal to the number of electron shells outside the nucleus;

2) The ordinal number of the main group elements is equal to the number of electrons in the outermost shell.

The periodic table of chemical elements is arranged according to:

1. The right decreases in turn, and increases from top to bottom.

2. The periodic table has 7 periods and 16 families. Each horizontal row is called a cycle, and each vertical row is called a family (group VIII contains three columns). These 7 cycles can be divided into short cycles and long cycles).

3. In the same period, from left to right, the number of electrons outside the nucleus of the element is the same, the number of electrons in the outermost shell increases in turn, and the atomic radius decreases (except for group zero elements). The ability to lose electrons is gradually weakened, the ability to gain electrons is gradually increased, the metallicity is gradually weakened, and the non-metallic ability is gradually enhanced.

4. In the same family, from top to bottom, the number of electrons in the outermost shell is the same, the number of electrons outside the nucleus gradually increases, the atomic radius increases, the atomic number increases, the metallicity of the element increases, and the non-metallicity decreases.

The periodic table of chemical elements is a list of chemical elements sorted by their atomic weights from smallest to largest. The list is usually rectangular in shape, with spaces in some element cycles, so elements with similar characteristics can be grouped into the same family, such as alkali metal elements, alkaline earth metals, halogen elements, noble gases, non-metals, transition elements, etc. This makes the periodic table form elemental divisions, which can be divided into seven main families, 7 auxiliary households, households, and 0 households.

Due to its ability to accurately characterize various elements and their relationships, the periodic table is widely used in chemistry and other scientific fields as a very useful framework for analyzing chemical behavior.

Periodic table of chemical elementsis a list of chemical elements sorted from smallest to largest according to their atomic number.

The list is roughly rectangular in shape, with spaces in the period of some elements, so that elements with similar characteristics are grouped into the same family, such as halogens and alkali metal elements.

Noble gases (also known as noble gases.

or noble gas) and so on. This results in the periodic table being divided into seven main and seven secondary groups, zero groups, and eight groups.

Atomic radius.

1) In addition to the 1st period, other periodic elements (noble gas elements.

except) decreases as the atomic number increases.

2) From top to bottom, the atomic radius of the atom increases with the increase of the number of electron layers. (5. Except for the sub-group during the sixth week of hail and celery).

Schematic diagram of the atomic structure of elements 1 to 20.

As follows: <>

The schematic diagram of the atomic structure of elements 20 to 30 is as follows:

Elements one to twenty are as follows:

1-5: H hydrogen, HE helium, LI lithium, BE beryllium, B boron.

6-10: C carbon, N nitrogen, O oxygen, F fluorine, ne neon.

11-15: Na sodium, mg magnesium, Al aluminum, Si silicon, P phosphorus.

16-20: S sulfur, Cl chlorine, Ar argon, K potassium, Ca calcium.

First Cycle Elements: 1 Hydrogen qīng, 2 Helium Hài Second Cycle Elements: 3 Lithium l Beryllium P Boron Péng, 6 Carbon Tàn, 7 Nitrogen Dàn, 8 Oxygen Yǎng, 9 Fluorine Fluorine Ne Nǎi).

Third Cycle Elements: 11 Sodium N Magnesium Měi, 13 Aluminum l Silicon Phosphorus Lín, 16 Sulfur Chlorine L Argon Yà

Fourth Cycle Elements: 19 potassium ji calcium gài

First cycle: hydrogen helium.

Second cycle: lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorone.

Third cycle: sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, argon.

Fourth cycle: potassium, calcium, scandium, titanium, vanadium, chromium, manganese.

Iron, cobalt, nickel, copper, zinc, gallium, germanium.

Arsenic, selenium, bromide, krypton.

Fifth cycle: rubidium, strontium, yttrium, zirconium, niobium.

Molybdenum, technetium, ruthenium.

Rhodium, palladium, silver, cadmium, indium, tin, antimony.

Tellurium, iodine, xenon.

Sixth cycle: cesium, barium, lanthanum, hafnium.

Tantalum, tungsten, rhenium, osmium.

Iridium, platinum, gold, mercury, and lead.

Bismuth, polonium, astatine, radon.

Seventh cycle: francium, radium, actinium.

1: Hydrogen H, the first cycle, the first empty group ia.

2: Helium, first cycle, group 0.

3: Lithium Li, second cycle, group ia.

4: Beryllium BE, second cycle, IIA group.

5: Boron B, Second Cycle, Group IIIA.

6: Carbon C, second cycle, group iva.

7: Nitrogen N, second cycle, group va.

8: Oxygen O, second cycle, group VIA.

9: Fluorine F, second cycle, group VIIA.

10: Neon, second cycle, group 0.

11: Na 3rd cycle, group ia.

12: Magnesium mg, the third cycle, the IIA group is staring at the blind.

13: Al-Al, Cycle III, Group IIIA.

14: Silicon SI, Cycle III, Group IVA.

15: Phosphorus, third cycle, group va.

16: Sulfurs, the third cycle, group VIA.

17: Chlorine CL, third cycle, group VIIA.

18: Argon, third cycle, group 0.

19: Potassium K, fourth cycle, group ia.

20: Calcium ca, fourth cycle, group IIA.