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The basic general knowledge about chemical elements is easy to learn, easy to remember to help students review knowledge easily. Let's find out with timhieulichsuquancaugiay.edu.vn right in the article below.

What is the concept of chemical element?

Chemical textbooks 8 Defining very clearly the concept of chemical elements? Accordingly, Chemical elements are a collection of similar atoms, with the same number of protons in the nucleus. Thus the number of protons (P) is considered to be the characteristic of a chemical element.

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Why is there any chemical elemental concept? In fact, we only refer to the extremely large atoms. For example, in order to create 1g of water, we need more than 10 lakh billion billion billion oxygen atoms, and the number of hydrogen atoms needs to be twice as much as that quantity. Therefore, instead of saying these atoms, the other atoms we will say this chemical element, the chemical element.

The atoms of the same chemical element have the same chemical properties.

Characteristics of chemical elements

Each chemical element (often called element) has a separate name and symbol for us to easily identify. The official name of the chemical element is prescribed by the International Union of Pure and Applied Chemistry (IUPAC – International Union of Basic Chemistry and Applied Chemistry).

The chemical element is a pure chemical, including an atomic atom, distinguished by the atomic number that includes the amount of protons in each nucleus (Wikipedia.org).

What is the chemical element like?

Each chemical element is represented by one or two letters, usually one of the first two letters in the name La – the element of the element, which has the first letter written in the form of capital, called symbolization learn.

Chemical symbols are prescribed uniformly used worldwide. And according to the convention, each symbol of that elemental atom. For example, want only 2 aluminum atoms or more than the two of us to write 2 Al.

Symbol some common elements:

How many chemical elements are there?

Up to now, science has known and proved that there are over 110 elements. In this, there are 92 elements found in nature, including on Earth, the sun, the moon and some stars …, the rest is synthesized by humans – artificial elements (according to textbooks (according to textbooks. Chemistry 8, Vietnam Education Publishing House).

• Natural elements (elements that make up the ingredients of the Earth shell) are in the Earth's crust very uneven.
• Oxygen is the most common element (accounting for 49.4%) and only 9 elements have accounted for almost 98.6% of the earth's shell.
• Hidro ranked 9th in volume but if considered according to the number of atoms, it is only behind oxygen.
• Of the 4 most essential elements for organisms, C, H, O and N, C and N are two elements of quite few elements that only account for 0.08% and 0.03% respectively.
• Some common elements in the Earth's crust such as oxygen (O), silicon (Si), aluminum (Al) …

See also: What is cubic atom? Find out az details

The meaning of the name of the chemical elements

Have you ever wondered why this chemical element is denoted as this letter, the other chemical element is denoted by another letter and what does they mean? There are chemical elements that come from the name of the mineral, there are elements that come from the names of the stars, there are elements that have the name originating from the names of the gods …

The meaning of the names of the chemical elements is synthesized by timhieulichsuquancaugiay.edu.vn in the table below:

Chemical element practice exercises

Practical exercises in chemical textbooks 8 after learning theory of “chemical elements” will help you review and memorize knowledge longer.

Practice exercises chemical element 1: Fill in the appropriate word in the blank

1/ Say these (1) types, those (2), the other type, in the chemical chemistry (3) this chemistry (4) the other chemistry.

2/ The atoms with the same (5) in the nucleus are (6) of the same type, belonging to the same (7) chemistry.

Suggestions for the answer:

Italy 1:

(1) atoms

(2) atoms

(3) Element

(4) Element

Italy 2:

(5) The number of protons

(6) atoms

(7) Element

Exercise 2: Answer the following questions

1/ What is chemical element?

2/ How to perform element? Example illustration

Suggestions for the answer:

1/ Chemical element is a collection of similar atoms, with the same number of protons in the nucleus.

2/ Each chemical element is represented by one or two of the first letters of that elemental Latin name, in which the first letter is capitalized, called the chemical symbol.

For example, chemical element hydrogen denotes H; Aluminum chemical elements are Al, iron chemical element symbol Fe …

Lesson 3: Answer the question

1/ What are the ways to write 3C, 40, 5CA?

2/ Use digits and chemical symbols: two nitrogen atoms, seven iron atoms, four aluminum atoms

Suggestions for the answer:

1/ Meaning of writing methods:

• 3C => Two carbon atoms
• 4o => four oxygen atoms
• 5ca => Five Calcium atoms

2/ Chemical elements:

• Two nitrogen atoms => 2n
• Seven iron atoms => 7Fe
• Four aluminum atoms => 4al

Above is the theory of chemical elements that timhieulichsuquancaugiay.edu.vn has summarized. Please review and do practice exercises to master more knowledge!

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