National Learning Camp - Camp B - Science Grade 9

National Learning Camp - Camp B - Science Grade 9

1. In our class we will : Do our best Listen Participate Ask questions Have fun!

2. Lesson 1 The Bohr Model

3. Short Overview

4. Short Overview Q1. According to Bohr’s atomic model, what is the structure called at the center of the atom? The center of the atom is called the nucleus.

5. Short Overview Q 2 . What are the particles inside the center called? The particles inside the center are protons and neutrons .

6. Short Overview Q3. What other particles are and important in an atom where are they located? The other important particles are electrons , and they are in orbits known as energy shells around the nucleus.

7. Lesson Purpose and Intention

8. Lesson Purpose and Intention This lesson is about a model of the structure of the atom as described by Niels Bohr and the limits of that structure. The lesson may also help you understand that scientists sometimes draw diagrams and use models to represent what cannot be seen with the naked eye.

9. Lesson Language Practice

10. Keywords/terms: 1. o rbit 2. protons 3. neutrons 4. valency

11. Match each scientific term with its correct definition by drawing a line to connect their boxes.

12. Lesson Activity

13. Component 4: Lesson Activity Component 4A The main lesson stimulus includes symbolic representations of the structure of atoms as well as two short paragraphs of text. The Bohr Model of an atom of Carbon Jose is in Grade 9. One day he said to his parents that his teacher had been talking about the structure of the atom in class, so he decided to research what he could find out for himself. He put together the following paragraph from several sources.

14. The Bohr Model of an atom of Carbon Niels Bohr In 1913, Niels Bohr proposed a model for the structure of an atom based on the work of Ernest Rutherford about the nucleus of atoms and Max Planck ’s quantum theory . Bohr suggested that the central heavy positive nucleus contains protons and neutrons and that the negatively charged electrons moved around the nucleus in circular paths called orbits. Although Bohr’s model is inaccurate in terms of the electron energy levels or shells it is still used today as an introduction to the Atomic Theory. The Quantum Mechanical Model of the Atom is currently accepted as more accurate. The symbols used in chemistry for the subatomic particles are neutrons no, protons p+, electrons e- .

15. Component 4B Q1. How many protons are there in the diagram? There are 6 protons in the nucleus. Q2. What is the name of the type of particle labeled Y, and how many are there in the diagram and what charge do they carry? The particles labeled Y are neutrons, there are 6 of them and they carry no charge .

16. Component 4B Q3. What is the name of the type of particle labeled Z, and why are there the same number as there are protons in the diagram, and what charge do they carry? The particles labelled Z are electrons and there are 6 in orbit around the nucleus, and they carry a negative charge, resulting in the atom being neutral in charge.

17. Component 4C Q1. Bohr based his theories of the structure of an atom on two other scientists. Name the two scientists. The two scientists on whose work Niels Bohr based his own atomic theory were Ernest Rutherford and Max Planck . Q2. What is the electron configuration for an atom of Carbon? The electron configuration for an atom of Carbon is represented as

18. Lesson Conclusion

19. Question 1: Has this lesson helped you to better understand what an atom is? If so, how?

20. Question 2: Which questions were easy to answer – the ones in Component 4B or Component 4C? Why?