"Elements" The Mystery of Material Composition PPT Courseware 3

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"Elements" The Mystery of Material Composition PPT Courseware 3

1. Elements:

1. Definition: A general term for a type of atoms with the same nuclear charge (number of protons)

Warm reminder: Element is a macro concept, only the type is considered, regardless of the number.

2. What determines the type of element is: nuclear charge (number of protons)

3. Category:

Metal elements: sodium, magnesium, iron,

Non-metallic elements: carbon, nitrogen, oxygen, chlorine

Noble gas elements: helium, neon, argon, krypton, xenon, radon

Thinking: What kind of elements do silicon, aluminum, potassium, neon and hydrogen belong to?

I will judge:

1. Sulfur dioxide (SO2) consists of one sulfur element and two oxygen elements.

2. Water molecules are composed of oxygen and hydrogen elements.

3. A water molecule consists of two hydrogen atoms and one oxygen atom.

4. Carbon dioxide is composed of carbon atoms and oxygen atoms.

5. A carbon dioxide molecule consists of one carbon atom and two oxygen atoms.

I will choose!

1. What determines the type of element is ( )

A. Number of protons B. Number of neutrons

C. Number of electrons D. Atomic mass

2. It is reported that “there are currently about 2 billion people suffering from iron deficiency anemia in the world.” “Iron” here refers to ( )

A. Elemental iron B. Iron element

C. Iron tetroxide D. Iron atom

1. Writing: If it is expressed by one letter, it should be expressed by capitalizing two letters. The first letter should be capitalized and the other letter should be lowercase.

2. The meaning of element symbols

Usually has two meanings

an element

an atom of an element

Examine the periodic table of elements and discuss the following questions

1 What type of element starts each cycle?

2 What type of elements are near the tail of each cycle?

3. What type of element does each cycle end with?

4. The above facts illustrate the regular connections between elements.

5. What is the relationship between elements and the periodic table?

3. Introduction to the structure of the periodic table of elements (Mendeleev)

1. Cycle:

Each horizontal row is called a cycle, and there are 7 cycles in total.

2. clan

Each vertical row is called a clan (three vertical rows, 8, 9, and 10, together form one clan), with a total of 16 clans.

3. The beginning of the periodic table of elements:

Metals--Non-metals--Rare gases

4. Atomic number = nuclear charge = number of protons in the nucleus = number of electrons outside the nucleus

The Meaning of the Periodic Table of Elements: An Important Tool for Learning and Researching Chemistry

(1) Provides a theoretical basis for finding new elements

(2) Since the chemical properties of elements that are closer together in the periodic table are more similar, it inspires people to search for new substances (such as semiconductor materials, catalysts, pesticides) within a certain area of ​​the periodic table.

Summary of this lesson

1. Elements

1. Definition: A general term for a type of atoms with the same nuclear charge (number of protons)

2. What determines the type of element is: nuclear charge (number of protons)

3. Classification: Metallic elements, non-metallic elements and rare gas elements

4. Element content in the earth’s crust: oxygen, silicon, aluminum, iron

2. Element symbols

1. Writing 2. Symbols represent meanings

3. Periodic table of elements

1. The composition of the periodic table of elements (period, group)

2. Atomic number = nuclear charge = number of protons in the nucleus = number of electrons outside the nucleus

3. The meaning of each symbol in the periodic table of elements

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For more information about the PPT courseware "The Mystery of the Composition of Elements and Materials", please click on the "Mystery of the Composition of Elements and Materials" ppt tag.

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Update Time: 2024-10-02

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