TEST BANK FOR GENERAL ORGANIC AND BIOCHEMISTRY 8TH EDITION KATHERINE

Chapter 2: The Structure of the Atom and the Periodic Table 1. What are the three primary particles found in an atom? A) neutron, positron, and electron B) electron, neutron, and proton C) electron, proton, and nucleon D) positron, electron, and nucleon E) proton, electron, and neutrino Ans: B 2. What is the value of the mass number in the isotope 131 53I? A) 53 B) 78 C) 126.9 D) 131 E) 184 Ans: D 3. What term is used to describe atoms of the same element that have different masses? A) radioactive B) constituents C) isotopes D) telomers E) isomers Ans: C 4. Which statement explains why isotopes have different mass numbers? A) Isotopes differ in the number of protons each contains. B) Isotopes differ in the number of electrons each contains. C) Isotopes differ in the number of neutrons each contains. D) Isotopes differ in the number of protons and neutrons each contains. E) Isotopes differ in the number of protons and electrons each contains. Ans: C 5. When a neutral atom gains one or more electrons, what type of particle is formed? A) an anion B) an isotope C) a proton D) a positron E) a cation Ans: A