1. Chapter 3 Atomic Structure: Images of the Invisible James A. Noblet California State University San Bernardino, CA  2007 Prentice Hall Chemistry for Changing Times, 11 th edition John W. Hill and Doris K. Kolb

2. Experiments by J.J. Thomson showed that cathode rays are composed of what elementary particles? 1.Protons 2.Electrons 3.Neutrons 4.Alpha particles 5. Positrons

3. Experiments by J.J. Thomson showed that cathode rays are composed of what elementary particles? 1.Protons 2.Electrons 3.Neutrons 4.Alpha particles 5. Positrons

4. A helium nucleus that is emitted during some radioactive decay processes is also called a(n): 1.Alpha particle 2.Beta particle 3.Gamma particle 4.Delta particle 5.Sigma particle

5. A helium nucleus that is emitted during some radioactive decay processes is also called a(n): 1.Alpha particle 2.Beta particle 3.Gamma particle 4.Delta particle 5.Sigma particle

6. Which of these electronic transitions would result in the emission of visible light (where n=energy level)? 1.n=5 to n=2 2.n=2 to n=5 3.n=3 to n=1 4.n=7 to n=3 5.n=4 to n=1

7. Which of these electronic transitions would result in the emission of visible light (where n=energy level)? 1.n=5 to n=2 2.n=2 to n=5 3.n=3 to n=1 4.n=7 to n=3 5.n=4 to n=1

8. Isotopes are elements that differ only in their: 1.Atomic number 2.Nuclear charge 3.Number of electrons in the neutral atom 4.Atomic mass 5.Chemical properties

9. Isotopes are elements that differ only in their: 1.Atomic number 2.Nuclear charge 3.Number of electrons in the neutral atom 4.Atomic mass 5.Chemical properties

10. Elements in the same group of the periodic table exhibit what tendency? 1.Similar chemical properties and reactivity 2.The same total number of electrons 3.Similar atomic masses 4.Similar appearance and physical properties 5.Different numbers of valence electrons

11. Elements in the same group of the periodic table exhibit what tendency? 1.Similar chemical properties and reactivity 2.The same total number of electrons 3.Similar atomic masses 4.Similar appearance and physical properties 5.Different numbers of valence electrons