2. helium: The chemical symbol is He, pronounced as Hà i..

3. Lithium: The chemical symbol is Li, pronounced lǐ.

4. Beryllium: The chemical symbol is Be, pronounced pí.

5. Boron: The chemical symbol is B, pronounced Pé ng.

6. carbon: the chemical symbol is c, which is pronounced tà n.

7. Nitrogen: The chemical symbol is n, pronounced dà n..

8. oxygen: the chemical symbol is o, pronounced y m 4 ng.

9. Fluorine: the chemical symbol is F, pronounced as fú.

10, neon: the chemical symbol is ne, which is pronounced as n m 4 i.

1 1, sodium: chemical symbol is Na, pronounced nà.

12, magnesium: the chemical symbol is Mg, which is pronounced as mě i.

13, aluminum: the chemical symbol is al, which is pronounced lǐ.

14, Silicon: the chemical symbol is si. Reading care:

15, phosphorus: chemical symbol is p, pronounced as lí n.

16, sulfur: the chemical symbol is s, which is pronounced as liú.

17, chlorine: the chemical symbol is Cl, which is pronounced as lǜ.

18, Argon: the chemical symbol is ar, a, pronounced y.

19, potassium: chemical symbol is k, pronounced Ji m.

20. Calcium: the chemical symbol is ca, pronounced gà i.

2 1, Scandium: the chemical symbol is sc, which is pronounced kàng.

22. Titanium: The chemical symbol is Ti, pronounced Tà i.

23. Vanadium: The chemical symbol is V, which is pronounced as fá n..

24. Chromium: The chemical symbol is Cr. Read gè.

25. Manganese: The chemical symbol is Mn, pronounced as měng.

26, iron: the chemical symbol is Fe, read tiū.

27. cobalt: the chemical symbol is co, which is pronounced as the incarnation of g.

28. Nickel: The chemical symbol is Ni, pronounced niè.

29, copper: the chemical symbol is Cu, read tóng.

30. Zinc: The chemical symbol is Zn. Read x and n.

Extended data

In the periodic table of elements, the elements are arranged in atomic order, with the smallest one at the front. One row in the table is called period and one column is called family. The atomic radius decreases from left to right and increases from top to bottom.

There is a "periodic table" in chemistry textbooks and dictionaries. This table reveals the secrets of the material world, unifying some seemingly unrelated elements to form a complete natural system. Its invention is a pioneering work in the history of modern chemistry, which has greatly promoted the development of chemistry.

When people see this watch, they will think of its earliest inventor, Mendeleev. 1869, Russian chemist Mendeleev arranged elements with similar chemical properties in the same column according to the relative atomic mass from small to large, and compiled the first periodic table of elements. The periodic table of elements reveals the internal relations between chemical elements, making it a complete system and one of the important milestones in the history of chemical development.

With the development of science, the vacancies left by unknown elements in the periodic table have been filled one after another. When the mystery of atomic structure was discovered, the arrangement changed from the relative atomic weight to the proton number of atoms (the number of electrons outside the nucleus or the number of nuclear charges), and the current periodic table of elements was formed.

Number the elements according to their order in the periodic table to get the atomic number. The atomic number has the following relationship with the atomic structure of an element:

Number of protons = atomic number = number of electrons outside the nucleus = number of nuclear charges.

Baidu Encyclopedia-Periodic Table of Elements