1. Atoms! Schwichtenberg

2. DO NOW Get out your graphing homework A student tests the amount of carbon found in the soil of 3 different types of plants and the soil without any plants. List the: – Independent variable – Dependent variable – Control Group – Hypothesis

3. DO NOW Get out your atom tutorial handout & your atom notes sheet Draw a picture with labels of an atom. Include this vocabulary: – Nucleus – Neutron – Proton – Electron

4. TASKS 1.Quiz 2.Complete graph (follow the steps from your notes!) 3.Complete: A look Inside the Atom online activity (see handout and website) Schwichtenberg.wikispaces.com/home

5. What is an atom?

6. An atom is the smallest basic unit of matter

7. Structure of an atom

8. Structure of an Atom

9. So, how big is an Atom?

10. So, how big is an atom?!

11. A substance made up of the same type of atom is an_______________.

12. What is a Molecule? A group of atoms bonded together Bond: A strong force of attraction holding atoms together in a molecule

14. PRACTICE!

15. Using the periodic table

16. How is the periodic table organized? Periods: (Rows) Shows the number of energy levels Groups: (Columns) All elements in a group have the same number of valence electrons. Elements in the same group share the same properties – do the same things

17. Valence electrons: the number of electrons in the outer shell of an atom

19. How do we represent atoms on paper? How to make a Bohr model: 1. Draw a circle to represent the nucleus of the atom.

20. How do we represent atoms on paper? 2. Add more circles outside the nucleus to represent energy levels (electron shells).

21. How do we represent atoms on paper? 3. Add electrons (as small dots) to each energy level as allowed until you have the proper number of electrons for a neutral element. (# of electrons should be = to the number of protons).

22. REMEMBER!

23. Stable

24. Ionic Bonds A covalent bond forms when atoms share a pair of electrons. Ionic bonds form between oppositely charged ions. Sodium atom (Na)Chlorine atom (CI)Sodium ion (Na + )Chloride ion (CI - ) Na loses an electron to CI ionic bond gained electron

25. Covalent Bonds covalent bonds Oxygen atom (O)Carbon atom (C)Oxygen atom (O) Carbon dioxide (CO 2 ) A covalent bond forms when atoms share a pair of electrons.