"Structure of Atom" The Mystery of Material Composition PPT Courseware 2

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"Structure of Atom" The Mystery of Material Composition PPT Courseware 2

1. Learning purposes:

1. Be able to name the various particles that make up atoms and their charging conditions. (emphasis)

2. Know the meaning of relative atomic mass and be able to look up the relative atomic mass table. (difficulty)

Rutherford concluded:

①The nucleus is very small and there is a lot of space inside the atom.

② There is a positively charged nucleus in the center of the atom. When the α particle passes near the gold nucleus, it is repulsed and changes its direction of motion;

③The mass of the atomic nucleus is greater than that of alpha particles. When alpha particles collide with the nucleus, they are bounced back.

2. Independent learning:

Knowledge point 1: History of discovery of the structure of atoms

The Rutherford experiment concluded:

①The nucleus of an atom is very _____, and there is a lot of _____ space inside the atom.

② There is a nucleus with _____ charge in the center of the atom. When the α particle passes near the gold nucleus, it is repulsed and changes its direction of movement;

③The mass of the nucleus is _____ than that of the alpha particle. The alpha particle is bounced back when it collides with the nucleus.

Knowledge point 2: The composition of atoms

1. Since atoms are the smallest particles in __________, atoms cannot be subdivided in __________. But structurally, atoms are divided into _____ (please fill in “can” or “can’t”). Atoms are composed of _____ electrically charged _____ in the center of the atom and _____ electrically charged _____ outside the nucleus. constitute. The nucleus is composed of two kinds of particles, _____ and _____, and neutrons are electrically _____.

2. Since the protons in the nucleus are positively charged, the nucleus is positively charged. The number of positive charges (that is, _____) is equal to the _____ outside the nucleus, but the electrical properties are opposite. Therefore, the electrical property of the atom is _____. Different types of atoms have different _____ inside the nucleus and different _____ outside the nucleus.

3. Collaborative exploration:

Study 1: The composition of atoms

1. Analyze and discuss Table 3-1 on P53 of the textbook. What patterns can you find?

①In an atom: number of protons = number of nuclear charges = number of electrons outside the nucleus;

② Atoms must have protons and electrons, but not necessarily neutrons (hydrogen atoms do not have neutrons);

③The number of protons is not necessarily equal to the number of neutrons;

④Different atoms have different numbers of protons and different numbers of electrons outside the nucleus.

2. Can you summarize the structure of an atom?

Exploration 2: Relative atomic mass

1. How to find the relative atomic mass of an atom?

(1) Definition method: Ar=the mass of a certain atom/the mass of a carbon-12 atom×1�12

(2) Approximate method: Ar≈number of protons + number of neutrons

2. It is known that the mass of a carbon atom, which is the benchmark for relative atomic mass, is 1.993×10-26 kg.

(1) If the mass of an aluminum atom is 4.482×10-26 kg, then the relative atomic mass of the aluminum atom is approximately ______.

(2) If the relative atomic mass of an oxygen atom is 16, then the mass of an oxygen atom is ____________.

3. Professor Zhang Qinglian, a famous Chinese chemist, collaborated with another scientist to determine a new value for the relative atomic mass of the element indium. The nuclear charge of the element indium is 49, and the relative atomic mass is 115. The number of neutrons in an indium atom is ( )

A.115　B.49　C.66　D.164

5. Classroom exercises:

1. Knowing the nuclear charge of an atom, we can determine its ( )

(A) Atomic weight (B) Number of protons

(C) Number of neutrons (D) Number of electrons

2. The nucleus of an atom (except ordinary hydrogen) is ( )

(A) Made of electrons and protons

(B) Made of protons and neutrons

(C) Made of electrons and neutrons

(D) Cannot be divided further

3. The relative atomic masses of carbon and magnesium are 12 and 24 respectively, then the ratio of the atomic masses of carbon and magnesium is ( )

A.12:1 B.2:12 C.2:1 D.1:2

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For more information about the PPT courseware "The Mystery of Matter: The Structure of Atoms", please click on the "The Mystery of Matter ppt Structure of Atom" ppt tag.

"Structure of Atom" The Mystery of Material Composition PPT Courseware 6:

"Structure of Atoms" The Mystery of Material Composition PPT Courseware 6 Review Questions 1. What are the definitions of molecules and atoms? 2. Characteristics of molecules and atoms? 3. What is the essence of chemical reaction? In a chemical reaction, molecules can be divided into atoms, but atoms cannot be divided further, so other methods can...

"Structure of Atom" The Mystery of Material Composition PPT Courseware 5:

"The Structure of Atoms" The Mystery of Material Composition PPT Courseware 5 Learning Objectives 1. Understand the structure of atoms and know the microscopic composition of atoms. 2. Understand the arrangement of electrons outside the nucleus and the formation process of ions. 3. Know the concept and calculation formula of relative atomic mass.

"Structure of Atom" The Mystery of Material Composition PPT Courseware 4:

"Structure of the Atom" The Mystery of the Composition of Matter PPT Courseware 4 Observe the table (Table 4-2) and think about the following questions: 1. What are the differences between different types of atoms? Different atoms have different numbers of protons, neutrons, and electrons. 2. All atoms are composed of protons, neutrons, and electrons..

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Update Time: 2024-10-05

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

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