1. A. B. C. Match each picture with the correct substance. 3) Oxygen gas 2) Salt is a compound 1) Mercury is a liquid element.

2. IsotopeNucleus Hydrogen–1 (protium) Hydrogen-2 (deuterium) Hydrogen-3 (tritium) What is the difference in these isotopes of hydrogen? 4 They have different numbers of nuetrons.

3. Isotopes are atoms of the same element that have different masses because they have different numbers of _____________. 5 Neutrons

4. Which two subatomic particles are found in the nucleus? Mass Number is _________ + _________ 6 7 Protons + Neutrons Protons and Neutrons

5. Atomic Number is the number of ______ in an atom. How many protons does neon (Ne) have? 8 9 Protons 10

6. Tell how many protons, neutrons and electrons this atom would have: F 10 16 9 Protons = 9 Neutrons = 7 Electrons = 9

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

8. Whose model of the atom is this? 13 Whose model of the atom is this? 14 Rutherford Thomson

9. Whose model of the atom is this? 15 What experiment does this picture go with? 16 Bohr Gold Foil Experiment

10. 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? 17

11. Draw a Bohr Model of Helium-3 (use the correct numbers of protons, neutrons and electrons, and put them all in the right place!) 18

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

13. 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)