1, dear Li, be happy and raise happiness. (hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, neon)

That beauty Guilin, beef needs calcium supplement. (sodium magnesium aluminum silicon phosphorus, sulfur chlorine argon potassium calcium)?

2, the first cycle: hydrogen helium-Qinghai?

The second cycle: lithium, beryllium, boron, carbon, nitrogen, oxygen and neon-carp skin holding carbon, eggs raising milk?

The third cyCle: Na, Mg, Al, Si, p, s, cl, ar-that beauty Guilin tooth green?

The fourth cycle: potassium and calcium-calcium supplement?

3. Hydrogen, helium, lithium, beryllium and boron (Li, Qinghai)

Carbon, nitrogen, oxygen, neon (soup, eggs, sheepskin, milk)?

Sodium magnesium aluminum silicon phosphorus

Sulfur, chlorine, argon, potassium, calcium (glass should be added with calcium)?

Extended data:

Symbolic meaning of elements:

Chemical symbols and their usage rules are the unique language of chemistry, an important tool to study the composition, structure and changing rules of substances in chemical science, and the basis for students to learn chemistry. Junior high school chemistry should attach importance to and do a good job in the teaching of chemical terms from the beginning, so that students can get used to using the language of chemical symbols to correctly express the chemical process and the composition, structure and changing law of its substances.

Chemical terms are abstract and difficult for students to understand at first. In order to overcome these cognitive difficulties, in the teaching process, students must first understand the meaning of element symbols, then deepen their understanding in the teaching of molecular formulas and chemical equations of substances, form a standardized and fixed chemical language, and use this chemical language to correctly express and study various chemical change processes and laws.