Untitled Document. 1. Which of the following best describes an atom? 4. Which statement best describes the density of an atom s nucleus?

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1 Name: Date: 1. Which of the following best describes an atom? A. protons and electrons grouped together in a random pattern B. protons and electrons grouped together in an alternating pattern C. a core of protons and neutrons surrounded by electrons D. a core of electrons and neutrons surrounded by protons 4. Which statement best describes the density of an atom s nucleus? A. The nucleus occupies most of the atom s volume but contains little of its mass. B. The nucleus occupies very little of the atom s volume and contains little of its mass. C. The nucleus occupies most of the atom s volume and contains most of its mass. D. The nucleus occupies very little of the atom s volume but contains most of its mass. 2. Which of the following is found farthest from the center of an atom? A. nucleus B. proton 5. C. neutron D. electron 3. Which of the following atoms has six valence electrons? A. magnesium (Mg) B. silicon (Si) Which of the following elements has the same Lewis dot structure as silicon? A. germanium (Ge) B. aluminum (Al) C. arsenic (As) D. gallium (Ga) C. sulfur (S) D. argon (Ar) page 1

2 6. Use the diagram below to answer the following question. 8. Silver (Ag) has 47 protons in each atom. Based on this information, which of the following also describes an atom of silver? A. It has no neutrons. B. It has 47 electrons. Which element will gain only one electron during a chemical reaction? C. It has 23 neutrons and 24 electrons. D. It has a total of 94 neutrons and electrons. A. silicon B. phosphorus C. sulfur D. chlorine 9. Which of the following statements best explains why elements in the same family of the periodic table have similar bonding properties? 7. Use the picture of an atom below to answer the question. A. The elements have similar atomic sizes. B. The elements have similar atomic masses. C. The elements have similar numbers of protons. D. The elements have similar valence electron configurations. Which statement best describes the part of the atom that is shown by the arrow? A. It is an electron, and it has a negative charge. B. It is an electron, and it has a positive charge. C. It is a proton, and it has a negative charge. D. It is a proton, and it has a positive charge. 10. Which of the following subatomic particles can be found inside the nucleus of an atom? A. electrons only B. neutrons only C. protons and neutrons D. protons, neutrons, and electrons page 2

3 11. How many electrons are in the outermost energy shell of a calcium atom? 14. Which distinguishes an atom of one element from an atom of a different element? A. 1 B. 2 C. 6 D. 8 A. the number of protons B. the number of neutrons C. the number of electrons D. the number of neutrons and protons 12. Which of the following identifies the number and location of protons in a lithium atom? A. 3 protons, located in the nucleus B. 7 protons, located in the nucleus C. 3 protons, located in an atomic orbital D. 7 protons, located in an atomic orbital 15. How many protons are in an atom of bromine? A. 115 B. 80 C. 45 D Which part of Dalton s atomic theory was disproved by further scientific research? A. All elements are composed of atoms. B. Atoms are indivisible particles. C. Atoms of different elements are different. D. Compounds are composed of two or more elements. 16. What is the mass number in atomic mass units of an atom with 14 protons, 14 electrons, and 16 neutrons? A. 14 amu B. 16 amu C. 30 amu D. 44 amu page 3

4 17. Which drawing best represents an atom of lithium? 18. Which accounts for most of the mass of an atom? A. A. electrons B. protons C. neutrons and protons D. electrons and neutrons B. 19. A diagram of the periodic table of the elements is shown below. C. D. In which region of the table would nonmetals be found? A. 1 B. 2 C. 3 D Which class of elements best conducts electricity? A. metals B. nonmetals C. semimetals D. noble (inert) gases page 4

5 21. Generally, how do atomic masses vary throughout the periodic table of the elements? 24. Refer to this portion of the periodic table to answer the question that follows. A. They increase from left to right and top to bottom. B. They increase from left to right and bottom to top. C. They increase from right to left and top to bottom. D. They increase from right to left and bottom to top. Which element in this group would be the least likely to react with other elements? A. Boron B. Carbon C. Neon D. Oxygen 22. Which of the following elements is classified as a metal? A. bromine B. helium C. sulfur D. lithium 25. Group I (the alkali metals) includes lithium (Li), sodium (Na), and potassium (K). These elements have similar chemical properties because they have the same. A. numbers of protons and neutrons B. numbers of electrons in the outer energy level C. numbers of protons in the nucleus D. numbers of neutrons in the nucleus 23. Which of the following is the most important factor in determining an element s place in the periodic table? A. Number of protons B. Number of neutrons C. Atomic Charge D. Atomic Density 26. Which statement correctly describes both gases and liquids? A. Their shapes stay the same in any container. B. Their shapes change when they are in different containers. C. Their volumes stay the same in any container. D. Their volumes change when they are in different containers. page 5

6 27. A scientist uses an instrument to observe the pattern of molecules in a substance. The picture below shows what the scientist sees. 30. Which glass contains only a gas? A. B. What state of matter is the scientist most likely observing? A. gas B. liquid C. vapor D. solid C. D. 28. Within a substance, atoms that collide frequently and move independently of one another are most likely in a 31. This diagram represents a neutral atom of boron-11. A. liquid. B. solid. C. gas. D. crystal. 29. Solids have a definite shape and volume. This is because A. the molecules in solids move past each other easily. B. the molecules in solids stay in a definite location and vibrate. C. the molecules in solids move freely in all directions. D. the molecules in solids do not move at all. How many protons and neutrons does boron-11 have? A. 11 protons, 11 neutrons B. 11 protons, 0 neutrons C. 6 protons, 5 neutrons D. 5 protons, 6 neutrons page 6

7 32. Use the graphic to answer the following question. 33. Nickel (Ni) is an element found in Group 10 of the periodic table of elements. Which element does the shell model represent? A. B. Based on its location in the periodic table, which of these is a property of nickel? A. Low density B. Strong semiconductor C. Highly reactive with other elements D. Good conductor of heat and electricity C. D. 34. Which elements are in the same period? A. lead and sodium B. oxygen and helium C. silver and tin D. tin and lead 35. What do all atoms of the same element have in common? A. number of neutrons B. mass number C. atomic number D. atomic mass page 7

8 36. Which element is an alkaline earth metal? 39. The diagram below shows the Periodic Table of the Elements. A. Li B. O C. Ne D. Ca Based on its location in the periodic table, which element in the table is least reactive? 37. Which is the best example of a pure substance? A. Li B. F C. Ca D. Kr A. peanuts B. milk C. gold D. air 40. Use the partial periodic table to answer the following question. 38. The smallest particle of any element that still has the properties of that element is called A. an atom. B. a compound. C. a solution. D. a mixture. A neutral atom of silicon has A. 12 electrons. B. 13 electrons. C. 14 electrons. D. 15 electrons. page 8

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