Name Class Date. The statements below are false. For each statement, replace the underlined term to make a true statement.
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1 Skills Worksheet Chapter Review USING KEY TERMS The statements below are false. For each statement, replace the underlined term to make a true statement. 1. Electrons have a positive charge. 2. All atoms of the same element contain the same number of neutrons. 3. Protons have no electrical charge. 4. The atomic number of an element is the number of protons and neutrons in the nucleus. 5. The mass number is an average of the masses of all naturally occurring isotopes of an element. UNDERSTANDING KEY IDEAS Multiple Choice 6. The discovery of which particle proved that the atom is not indivisible? a. proton c. electron b. neutron d. nucleus 7. How many protons does an atom with an atomic number of 23 and a mass number of 51 have? a. 23 c. 51 b. 28 d In Rutherford s gold-foil experiment, Rutherford concluded that the atom is mostly empty space with a small, massive, positively charged center because a. most of the particles passed straight through the foil. b. some particles were slightly deflected. c. a few particles bounced straight back. d. All of the above Holt Science and Technology 20 Introduction to Atoms
2 9. Which of the following determines the identity of an element? a. atomic number b. mass number c. atomic mass d. overall charge 10. Isotopes exist because atoms of the same element can have different numbers of a. protons. c. electrons. b. neutrons. d. None of the above Short Answer 11. What force holds electrons in atoms? 12. In two or three sentences, describe Thomson s plum-pudding model of the atom. Math Skills 13. Calculate the atomic mass of gallium, which consists of 60% gallium-69 and 40% gallium-71. Show your work below. 14. Calculate the number of protons, neutrons, and electrons in an atom of zirconium-90 that has no overall charge and an atomic number of 40. Show your work below. Holt Science and Technology 21 Introduction to Atoms
3 CRITICAL THINKING 15. Concept Mapping Use the following terms to create a concept map: atom, nucleus, protons, neutrons, electrons, isotopes, atomic number, and mass number. Holt Science and Technology 22 Introduction to Atoms
4 16. Analyzing Processes Particle accelerators are devices that speed up charged particles in order to smash them together. Scientists use these devices to make atoms. How can scientists determine whether the atoms formed are a new element or a new isotope of a known element? 17. Analyzing Ideas John Dalton made a number of statements about atoms that are now known to be incorrect. Why do you think his atomic theory is still found in science textbooks? 18. Analyzing Methods If scientists had tried to repeat Thomson s experiment and found that they could not, would Thomson s conclusion still have been valid? Explain your answer. Holt Science and Technology 23 Introduction to Atoms
5 INTERPRETING GRAPHICS Use the diagrams below to answer the questions that follow. 19. Which diagrams represent isotopes of the same element? 20. What is the atomic number for A? 21. What is the mass number for B? Holt Science and Technology 24 Introduction to Atoms
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