"Elements" The Mystery of Material Composition PPT Courseware 2

Description

"Elements" The Mystery of Material Composition PPT Courseware 2

learning target

1. Know the concept of elements and memorize the order of content of elements in the earth's crust.

2. Memorize the names and symbols of the first 20 elements in the periodic table.

3. Understand the periodic table of elements and be able to obtain regular information from it.

1. Elements

1. Concept: An element is a general term for a type of atoms with the same nuclear charge (i.e., the number of protons in the nucleus).

2. An element can contain a variety of atoms, but these atoms must have the same number of protons, but different numbers of neutrons and relative atomic masses.

3. The number of protons determines the type of atom, and the number of protons determines the type of an element.

4. Elements are made of atoms.

5. Matter is composed of elements on a macroscopic level

2. Element classification

There are tens of millions of substances in nature, and there are more than 100 basic elements.

Metal elements: gold, silver, copper, mercury, aluminum, etc.

Non-metallic elements: carbon, oxygen, nitrogen, iodine, etc.

Noble gases: helium, neon, argon, krypton, xenon

3. Application and significance of elements

1. The nuclear charge (i.e. the number of protons in the nucleus) determines the type of element;

2. Elements are a macro concept, only talking about types, not numbers and sizes.

Give it a try:

Water contains two elements: hydrogen and oxygen.

Water contains two elements, hydrogen and oxygen.

An introduction to the structure of the periodic table of elements (Mendeleev)

1.Period

Each horizontal row is called a cycle, and there are ____ 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 ____ clans.

3. Metals - non-metals - rare gases

4.Atomic number

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

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Update Time: 2024-10-02

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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