When it comes to element knowledge, it is important to remember common element symbol names. Naturally, these elements all have a place in the periodic table. Generally speaking, the symbolic names of the first 20 elements in the periodic table must be remembered.
In addition, combined with the contents of the whole textbook, some elements should be added, such as: metal elements appearing in the metal activity sequence table: zinc, iron, tin, lead, copper, mercury and silver; In addition, platinum, gold, titanium, barium, manganese, iodine and other elements are often mentioned and need to be remembered.
When memorizing the first 20 elements, after learning the knowledge about the extranuclear electron configuration of atomic structure, we can relate the number of electron layers and outermost electrons in the schematic diagram of atomic structure with the relationship between periods and families in the periodic table, so as to deepen our understanding of the periodic table. However, don't make such a connection with the post-20 s elements, you will study further in high school.
It should be emphasized that the earlier the element symbols are recited, the better. It's better to remember some symbol names of elements when you start to learn chemistry, rather than wait until you talk about "elements" later. Because, in the early stage of learning chemistry, you will often come into contact with substances. For convenience, teachers often use the symbol "chemical formula" to represent substances. If you are familiar with the names of element symbols earlier, you will not be unfamiliar with these material symbols and reduce many cognitive obstacles. In addition, extending the time can also distract the difficulty of memory.
Quasi-high school graduates answer that you need to recite, and you must recite. You just don't need to recite the whole text (doge). First, you can try to memorize the first 20 elements, and then go deep into the first 36 elements. Of course, there is a simpler way, that is, to put the main group elements and group 0 elements vertically back. Then the transition element still only needs to recite 2 1 to 30 bits. This is because other elements are less learned, which is the best way to save time. If you have a good memory, you can recite the whole text at that time.