"Symbols Representing Elements" PPT

Description

"Symbols Representing Elements" PPT

Part One: Introduction of New Course

1. Matter is composed of ____________________

2. Matter is composed of ______

There are more than 110 kinds of elements discovered so far. How to express the elements that make up matter?

Review: The role and meaning of symbols

Able to express things simply and clearly

Avoid confusion caused by different shapes

It can avoid confusion caused by different expressions in different languages.

Explore new knowledge

Symbols representing elements PPT, part 2: element symbols

1. The writing element is the Latin abbreviation.

(The first letter is capitalized and the second letter is lowercase)

【Group cooperative learning】

Ask each other, recite, and remember common element symbols

【Everyone expresses his own opinion】

Correct the following incorrect element names or symbols

Carbon Manganese Calcium Magnesium Chloride Sodium

C MN CA Ma CL Hg Ne

Symbols representing elements PPT, the third part: summary

1. The writing element is the Latin abbreviation.

(The first letter is capitalized and the second letter is lowercase)

2. Meaning

①From a macro perspective: represents an element

②From a microscopic perspective: represents an atom of this element

③Indicates a certain element (for elements composed of atoms)

For example: "H"

① represents hydrogen element ② represents a hydrogen atom

For example: "Fe"

① represents iron element ② represents an iron atom ③ represents iron element

Note: When you want to represent multiple atoms, the number of atoms should be written directly in front of the element symbol. If you want to represent two magnesium atoms, it should be written as "2Mg", but at this time the symbol no longer represents the concept of the element and cannot be said into two magnesium elements, because elements can only be talked about their types, not their numbers.

Symbols representing elements PPT, Part 4 content: Class summary

1. Representation method of element symbols:

Represented by the first Latin capital letter of the element,

If there are duplicates, take the first two letters and the second letter is lowercase.

2. The meaning of element symbols:

(1) (macro) represents an element

(2) (microscopic) represents an atom of this element

(3) (Macroscopic) Substances directly composed of atoms can also represent such substances

Symbols representing elements PPT, part 5: battlefield exercises

1. The following chemical symbols represent two oxygen atoms ( )

A． 2O B. 2O2 C． CO2 D. O2

2. The three most abundant elements in the earth’s crust, in order from most to least, are ( )

A.Al>Fe>Ca

B.Fe>Ca>Al

C.O>Si>Al

D.Si>O>Al

3. The main mineral components printed on the label of a certain mineral water are as follows: Ca: 20, K: 39, Mg: 3, Zn: 0.06, F: 0.02, etc. The Ca, K, Mg, Zn and F here refer to - ( )

A． Elemental substance B. Element c. Metal ions D. molecular

Symbols representing elements PPT, Part 6: Structural characteristics of the periodic table of elements

1. 7 horizontal rows, each horizontal row is called a cycle, there are 7 cycles in total. There are three short cycles, three long cycles, and one incomplete cycle.

2. There are 18 vertical rows, and each vertical row is called a family. (The three vertical rows 8, 9, and 10 together form a family, called the eighth family.) 7 main families, 7 sub-family, and a zero family. An eighth clan.

Atomic number:

The periodic table numbers elements in order of increasing nuclear charge. The atomic number is numerically the same as the nuclear charge.

According to the classification of elements, the distribution of various elements:

Metallic elements are mainly distributed on the left side of the periodic table. Each cycle begins with a metallic element.

Non-metallic elements are mainly distributed on the right side of the periodic table.

The noble gas elements are located in the last column of the periodic table.

effect:

Find: element symbol, relative atomic mass, etc.

Speculation: properties of elements, new elements, etc.

Symbols representing elements PPT, Part 7: Class summary and assignments

Class summary

1: Element symbol

①Memory

②Meaning of expression

③Application

2: Periodic table of elements

after class homework

1. Select from the textbook exercises

2. Complete the exercises in this lesson in the exercise book

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, PPT download of symbols representing elements, .PPT format;

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"Symbols Representing Elements" PPT courseware:

"Symbols Representing Elements" PPT Courseware Part One Content: Class Review 1. Are the following statements correct? a. Carbon monoxide is composed of two elements, carbon and oxygen ( ) b. Carbon monoxide is composed of one carbon element and one oxygen element ( ) 2. By ______..

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Update Time: 2024-10-18

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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