2. Matter: Anything that has volume and mass Mass: The quantity of matter an object has 1. Explain the difference between matter and mass.

3. Atoms are the smallest part of an element that has all the properties of that element. 2. Explain how elements and atoms are related.

4. John Dalton: Discovered that all matter is made up of individual particles called atoms, which cannot be divided 1.All elements are composed of atoms 2.All atoms of the same element have the same mass and atoms of different elements have different masses 3.Compounds contain atoms of more than one element 4.In a particular compound, atoms of different elements always combine in the same way 3. Who is John Dalton and what are the four main points of his theory.

5. Thomson The atom is made up of even smaller particles Rutherford He proposed the idea of the nucleus and location of + charge Bohr Electrons are arranged around the nucleus in energy levels 4. List what Thomson, Rutherford, and Bohr contributed to the atomic theory.

6. DaltonThomson RutherfordBohr

7. ChargeMassLocation Protons +1 amuIn Nucleus Neutrons =1 amuIn Nucleus Electrons -Negligible Outside of Nucleus 5. Complete the Chart a.How are electrons arranged around the nucleus? Electrons are arranged in Electron Energy Levels outside of the nucleus.

8. 6. Draw a picture of a carbon-12 atom.

9. 7. Draw a picture of a Lithium-7 atom.

10. 7 a. What about Titanium? 22 8. How many protons does nitrogen always have?

11. 9. Complete the following isotope chart. Carbon - 12Carbon - 16Sulfur - 23Sulfur - 25 # of protons 6616 # of neutrons 61079 # of electrons 6616

12. 10. Ion Practice Element Name Ion Symbol Number or Protons Number of Electrons Number of Electrons Lost or Gained FluorineF-910gained one Potassium K +11918 lost one Calcium Ca+2 2018Lost two BromineBr -1 3536 Gained one

13. Ion Same atomic # and same mass number: Different number of electrons (charge!) Isotope: Same atomic #; different mass number: Different number of neutrons 11. Explain the difference between an ion and an isotope.

14. Compound: Pure substance made up of two or more elements Molecule: Smallest part of a compound that still has all of the properties of that compound 12. Explain how a compound and a molecule are related.

15. Any Questions? Section 3 Packets due tomorrow!