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Unformatted text preview: Name: ___________________________________ CH101 Structure of the Atom – Study Guide sections 2.5 and 2.6 in the textbook Structure of the Atom (Section 2.5) Most of the mass of an atom is contained in the _____________________ of the atom. Most of the volume of an atom is __________________ space. The nucleus is surrounded by negatively charged ____________________ (give the name of the particle). A neutral atom must contain equal numbers of _____________________ and _____________________. Explain how Rutherford’s Gold Foil Experiment indicates the existence of the nucleus: Subatomic Particles (Section 2.6) AMU stands for: _____________________________________________and represents a very (circle one) small or large mass. Complete the following table: Particle Proton Mass (amu) 1 Charge (relative) 0 ‐1 Based on this ____________________ have almost no mass compared to the other particles. Practice Problems: Give the atomic numbers for each of the following elements using a periodic table: C _____ Fe _____ Br _____ Define isotope: Mass number is equal to the number of ____________________ + ________________________. The mass number is NOT on the periodic table. Mass number only represents the mass of ONE isotope, not the masses of all isotopes found in nature. The mass number can be written in the following two formats. mass # Cl or Cl‐35 mass # Ions are ___________________ particles formed when an element gains or loses ______________________. For ions the number of _______________________ does not equal the number of electrons. For example, an element with two more protons than electrons will have a 2+ charge. An element with three more electrons than protons will have a 3‐ charge. Complete the following table: Symbol Protons Neutrons 2+ 34 65 3+ 34 36 79 Cl
Zn Electrons Mass Number Charge End of Chapter Practice Problems Tro First Edition: #49, 53, 55, 59, 63 Tro Second Edition: #47, 51, 53, 57, 61 answers are located in Appendix III of the textbook Take the Quiz on Blackboard 2 ...
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- Spring '11