The document provides information about elements, compounds, mixtures and Bohr models including: 1) An element is a pure substance made of only one type of atom that cannot be broken down further. 2) A compound is a pure substance made up of two or more different types of atoms chemically bonded together. 3) A mixture is a combination of two or more substances blended together without chemical bonding between ingredients.

5. Bohr Model Each element has a UNIQUE amount of PROTONS. Protons and Neutrons exist together in the ___________________ of the atom. Surrounding the nucleus, is the electron cloud are the negatively charged particles called _______________. Nucleus Electrons

6. Bohr Model The periodic table gives us clues about drawing the Bohr Models. For example, the rows (across) represent the number of shells or paths a simple element contains. In addition, if you count the number of elements in each of the first three rows , that number equals the maximum number of electrons allowed for each shell.

8. Bohr Model 1 1 2 2 3 3 Row # # of Energy Levels

9. Bohr Model 2 8 8 2 8 8 Row # # of Elements in the Row Maximum # of Electrons for that Energy Level Valence 1 # of electrons in outermost shell 2 3

10. Bohr Model for Helium Row: # of Protons: # of Neutrons: # of Electrons: 1 2 4-2=2 2 P=2 N=2 2 Element Information Bohr Model Helium

11. Bohr Model for Helium F= 8 V = 2 He Element Family # + Valence Electron Dot Diagram (LEWIS DOT) Helium

12. Bohr Model for Helium Row: # of Protons: # of Neutrons: # of Electrons: 2 6 12-6=6 6 P=6 N=6 2 4 C Element Information Bohr Model Lewis Dot Carbon

20. Compound Which One?

21. Which One?

22. Which One?

23. Mixture Which One?