"Symbols Representing Elements" PPT Courseware

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"Symbols Representing Elements" PPT Courseware

Part One: 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. A pure substance composed of __________ is called an element; a pure substance composed of __________ is called a compound.

3. The most abundant element in the earth’s crust is ______, and the most abundant metallic element is _______.

4. Matter is composed of ______________

5. Matter is composed of ____________

Symbols representing elements PPT, part 2: element symbols

1. Definition: An internationally adopted symbol for representing elements.

2. Expression method:

(1) Represented by the first letter of the Latin name of the element.

(2) If the first capital letter of the Latin names of several elements is the same, the second letter can be added in lowercase to distinguish them.

3. Writing principles:

The first letter must be capitalized

The second letter must be lowercase

think

N represents nitrogen element or one nitrogen atom. How does it represent two nitrogen atoms?

Symbols representing elements PPT, part 3: Periodic table of elements

Structural features 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 assigns numbers to 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 4: 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.

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

2. Periodic table of elements

Symbols representing elements PPT, Part 5: Practice

1.Write the following element symbols correctly ( )

A． MN B. CA

C. mg D. Zn

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 following chemical symbol represents two oxygen atoms ( )

A． 2O B. 2O2

C. CO2 D. O2

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:

"Symbols Representing Elements" PPT Part One Content: New Lesson Introduction 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...

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Update Time: 2024-11-21

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

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