1. Warm Up What is the difference between atomic number and mass number? (Write down the question and your answer)

2. Card Sort Directions Place the cards under the name of the correct scientist. Don’t use your notes!

3. Dalton 1) All matter made of tiny particles called atoms 2) All atoms of the same element are identical 3) Atoms are indivisible (can’t be broken into smaller parts) 4) Different atoms combine to make compounds 5) Atoms are rearranged during chemical changes Thomson Discovered Electrons Plum Pudding Model

4. Rutherford Bohr Discovered that atoms have a nucleus Had the idea that electrons are in orbits around the nucleus

5. Is the mass of the water intensive or extensive? Is the color of the water intensive or extensive? Is the odor of the water intensive or extensive? 1 2 3 Extensive Intensive

6. Is the volume of the water intensive or extensive? Is the conductivity of the water intensive or extensive? (conductivity is ability to conduct electricity) 4 5 Intensive Extensive

7. IsotopeNucleus Hydrogen–1 (protium) Hydrogen-2 (deuterium) Hydrogen-3 (tritium) What is the difference in these isotopes of hydrogen? 6 They have different numbers of nuetrons.

8. Isotopes are atoms of the same element that have different masses because they have different numbers of _____________. 7 Neutrons

9. Which two subatomic particles are found in the nucleus? Mass Number is _________ + _________ 8 9 Protons + Neutrons Protons and Neutrons

10. Atomic Number is the number of ______ in an atom. How many protons does neon (Ne) have? 10 11 Protons 10

11. Write the nuclear notation of Neon – 22. How many neutrons would Neon-22 have? 13 12 Ne 22 10 12

12. Tell how many protons, neutrons and electrons this atom would have: F 14 16 9 Protons = 9 Neutrons = 7 Electrons = 9

13. Dalton’s Theory (Postulates) 1) All matter made of tiny particles called atoms 2) All atoms of the same element are identical 3) Atoms are indivisible (can’t be broken down into smaller parts) 4) Different atoms combine to make compounds 5) Atoms are rearranged during chemical changes 2 of Dalton’s theories were wrong. Which two are they? 15

14. Whose model of the atom is this? 16 Whose model of the atom is this? 17 Rutherford Thomson

15. Whose model of the atom is this? 18 What experiment does this picture go with? 19 Bohr Gold Foil Experiment

16. Draw a Bohr Model of Helium-3 (use the correct numbers of protons, neutrons and electrons, and put them all in the right place!) 20

17. IsotopeAtomic Mass Percentage of Abundance Boron - 1010.0119.9% Boron - 1111.0180.1% Silicon - 2827.9792.2% Silicon - 2928.974.6% Silicon - 3029.973%

18. Put the following into nuclear notation, and tell how many protons, neutrons, electrons each has. 1. Atomic Number 39, mass number 89 2. Xenon – 135 (symbol is Xe) 3. An atom that has 18 protons and 22 neutrons 4. Platinum-198 (symbol is Pt)