"Atoms" PPT courseware 2 of the particles that make up matter

Description

"Atoms" PPT courseware 2 of the particles that make up matter

1. Preliminary understanding of atoms

Characteristics of atoms:

Atoms are small

quality

Have volume

How much is the mass of an atom?

The mass of a carbon atom is:

0．00000000000000000000000001993kg

That is, the mass of an oxygen atom of 1.993×10-26 kg is:

0．00000000000000000000000002657kg

That is, the mass of an iron atom of 2.657×10-26 kg is:

0．00000000000000000000000009288kg

That is 9.288×10-26 kg

2. Relative atomic mass

The mass of an atom is so small that it is inconvenient to write and remember.

International regulations: 1/12 of the mass of a carbon atom is used as the standard, and the mass of other atoms is compared with it.

Relative atomic mass = mass of a certain atom/mass of a carbon atom × 1/12

Note: Relative atomic mass is just a ratio, not the actual mass of the atom. The unit is 1

Observe and think

1 proton carries one unit of positive charge

Neutrons are uncharged

1 electron carries one unit of negative charge

It can be concluded from the table:

1. The composition of atoms: The particles that make up atoms are generally protons, neutrons, and electrons

2. In an atom: nuclear charge = number of protons = number of electrons

3. The number of protons and the number of neutrons are not necessarily equal

4. Different types of atoms have different numbers of protons.

5. There are no neutrons in the hydrogen nucleus

3. The composition of atoms

1.Atomic structure

Nucleus

Proton (+)

Neutron (uncharged)

electronic(-)

2. Nuclear charge = Number of protons inside the nucleus = Number of electrons outside the nucleus

Calculation of relative atomic mass approximate values:

According to experimental determination:

The mass of an electron is very small, 1/1836 of the mass of a proton

Therefore, the mass of an atom is mainly concentrated in the nucleus

Relative atomic mass ≈ number of protons + number of neutrons

Keywords: Particles constituting matter teaching courseware, atomic teaching courseware, Beijing curriculum reform version ninth grade chemistry PPT courseware download, ninth grade chemistry slide courseware download, Particles constituting matter PPT courseware download, atoms PPT courseware download, .PPT format ;

For more information about the PPT courseware "Particle Atoms Constituting Matter", please click on the PPT Atom PPT tag that constitutes matter.

"Atomic Structure and Periodic Table of Elements" Periodic Law of Material Structure PPT (Lesson 2 Atomic Structure and Properties of Elements):

"Atomic Structure and Periodic Table of Elements" Periodic Law of Material Structure Elements PPT (Lesson 2 Atomic Structure and Properties of Elements) Part One Content: Learning Objectives Course Standards 1. Understand the properties of alkali metal elements and halogen elements and their placement in the periodic table of elements relationship between the central position. ..

"Atomic Structure and Periodic Table of Elements" Periodic Law of Elements in Material Structure PPT (Lesson 1 Atomic Structure and Periodic Table of Elements Nuclides):

"Atomic Structure and Periodic Table of Elements" Periodic Law of Material Structure Elements PPT (Lesson 1 Atomic Structure Periodic Table Nuclides) Part One Content: Learning Objectives Course Standards 1. Understand the electron arrangement outside the nucleus. 2. Know the structure of the periodic table of elements. 3. Know..

"Atomic Structure and Properties of Elements" Atomic Structure and Periodic Table of Elements PPT Download:

"Atomic Structure and Properties of Elements" Atomic Structure and Periodic Table PPT Download Part One: Literacy Objectives 1. Know the atomic structure and characteristics of alkali metal elements and halogen elements through the atomic structure and atomic radius information in the textbook tables. 2. Through teaching materials..

File Info

Update Time: 2024-11-21

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

Preview