The document discusses the atomic models of Dalton, Thomson, Rutherford, and Bohr, noting that atoms are made up of protons, neutrons, and electrons. It also describes the organization and structure of the periodic table, including how elements are classified into groups based on their atomic structure and properties such as density, conductivity, and reactivity. Finally, it defines isotopes as variations of elements that contain different numbers of neutrons and can undergo alpha, beta, or gamma radioactive decay.

1. Elements & Periodic Table Notes

2. Atoms are made of 3 sub-atomic particles…

3. Dalton’s Model of Atom… Smooth spheres that are not made of smaller particles…

4. Thomson’s Model of Atom Negative electrons embedded in positive charged sphere.

5. Rutherford’s Atomic Model… The positive charge of an atom is located in the nucleus…

6. Bohr Atomic Model… Electrons move in orbits like planets…

7. Modern Cloud Model… Electrons orbit in cloud-like energy levels

8. How many protons in an atom…

9. Reading the Periodic Table

10. The Organization of the Periodic Table Reflects the Structure of Atoms

11. Organizing the Periodic Table

12. Metals vs. Non-Metals

13. Metalloids

14. Main Groups

15. Carbon Group…et al

16. Trends in Reactivity

17. Trends in Atomic Size

18. Elements can be Classified by… Density Thermal conductivity (conduct heat) Electrical conductivity Hardness Melting temperature etc

19. Isotope A variation of an element that contains a different number of neutrons than the stable element. Example; plutonium 238. Produce radioactivity. There are three types…

20. Alpha decay…

21. Beta decay…

22. Gamma decay…