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THE STRUCTURE OF THE ATOM

Core Competencies

1. Living and practicing the teachings of his religion
2. Live and practice honest behavior, discipline, responsibility, care (mutual cooperation,
cooperation, tolerance, peace), courteous, responsive and pro-active and show an attitude as
part of the solution to various problems in interacting effectively with the social and natural
environment as well as in placing oneself as a reflection of the nation in world relations.
3. Understand, apply, analyze factual, conceptual, procedural knowledge based on curiosity
about science, technology, arts, culture, and humanities with insights into humanity,
nationality, statehood and civilization related to the causes of phenomena and events, and
apply procedural knowledge to the field of study that specific according to their talents and
interests to solve problems.
4. Processing, reasoning, and presenting in the realm of concrete and abstract realms related to
the development of what they learn in school independently, and are able to use methods
according to scientific principles.

Basic Competiences

3.2 Analyzing the development of atomic models from the atomic models of Dalton, Thompson,
Rutherford, Bohr, and Quantum Mechanics.

4.2 Describe natural phenomena or experimental results using atomic models.

Contents

A. The Development of the Atomic Theory
B. Atomic Number anda Mass Number

C. Isotopes, Isobars, and Isotones
D. Bohr’s Atomic Model

Learning Objectives

After studying the chapter, students are expected to be able to :
1. Explain the development of the atomic theory or model : Dalton, Thomson, and Rutherford.

2. Describe the structure of atom containing subatomic particles: protons, neutrons, and electrons.
3. Define atomic number (Z) and mass number (A).

4. Use the atomic number and mass number to determine the number of protons, electrons, and

neutrons inside an atom.
5. Define isotopes, isobars, and isotones.

6. Explain Bohr’s atomic model
7. Writte down the electron configuration of atoms (Z< 20)

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