Atomic Theory Red Assignment
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1 Atomic Theory Red Assignment Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which particle s mass is similar to the mass of a proton? A. an atom B. a nucleus C. a neutron D. an electron 2. Each element is made up of different atoms. The table below compares two elements. Element 1 Element 2 Atomic number 10 9 Mass number What do the elements in the table have in common? A. Atoms in each element have 10 nuclei. B. Atoms in each element have 10 protons. C. Atoms in each element have 10 neutrons. D. Atoms in each element have 10 electrons. 3. The diagram below shows a model of an atom. Which label points to the nucleus? A. A B. B C. C D. D
2 4. Calcium is an element. What is the smallest particle of calcium that has the same chemical properties of calcium? A. an atom of calcium B. a proton from a calcium atom C. an electron from a calcium atom D. a molecule that contains calcium 5. Angelo drinks a large glass of water every morning when he wakes up. Which statement best describes the chemical makeup of the water Angelo drinks? A. It is made up of a single atom composed of protons, neutrons, and electrons. B. It is made up of an electron cloud surrounding a dense nucleus. C. It is made up of many molecules containing atoms joined together by chemical bonds. D. It is made up of protons and neutrons arranged in a repeating pattern. 6. Which of these statements describes a fact about an atom s nucleus? A. It is negatively charged. B. It is smaller than an electron. C. It is the same size in all atoms. D. It is made of neutrons and protons. 7. Which of these statements describes a fact about an electron cloud? A. It is the most massive part of an atom. B. It is made up of electrons and neutrons. C. It is where an atom s electrons are found. D. It is located in the center of an atom s nucleus. 8. An atom of the element gallium (Ga) has 31 protons and 39 neutrons. What is the atomic number of gallium? A. 8 B. 31 C. 39 D In the early 1900s, Ernest Rutherford set up an experiment to study the atom. He bombarded thin metal sheets with protons and neutrons. He found that most of particles got deflected a bit, but some of them bounced back as if bouncing off a brick wall. What conclusion came from this experiment? A. Atoms are too small to see. B. Atoms have a positive charge. C. Atoms are composed of metal. D. Atoms are mostly empty space.
3 10. Why is the mass of an atom s electrons not included in the atom s mass number? A. The electrons move so fast that their mass cannot be measured. B. The electrons negative charge cancels out their masses. C. The electrons mass is represented in the atomic number. D. The electrons are much less massive than the rest of the atom. 11. Look at the pairs of particles listed. Which pair has masses that are most similar? A. neutron and proton B. electron and proton C. nucleus and neutron D. electron and nucleus 12. A British scientist named J. J. Thomson discovered the electron in He suggested that the atom looked like the model below. A. Both models contain a nucleus and an electron cloud. B. Both models include negative charge and positive charge. C. Both models show positive charge spread through an area of the atom. D. Both models show most of the mass of the atom at the center. Short Answer 1. A British scientist named J. J. Thomson discovered the electron in He suggested that the atom looked like the model below.
4 Write two or three sentences about how our understanding of atoms today is both similar and different from Thomson s model. 2. The element lithium (Li) has an atomic number of 3. Identify what each label stands for in the atom model. Explain how you know that the diagram above represents a lithium atom.
5 Atomic Theory Red Assignment Answer Section MULTIPLE CHOICE 1. ANS: C A is incorrect because the mass of an atom includes the mass of all the protons, neutrons, and electrons in the atom. B is incorrect because a nucleus can contain multiple protons as well as neutrons. C is correct because a neutron has a mass similar to the mass of a proton. D is incorrect because an electron s mass is very small compared to the mass of a proton. Knowledge 1: Recall Bloom's Traditional: Knowledge Bloom's Revised: Remembering REF: 50e44d0e-e685-11de-9c f0d2ea KEY: protons atoms neutron nucleus MSC: Test Generator IN g8_u2 Lesson4 Quiz 2. ANS: C A is incorrect because atoms always have only one nucleus. B is incorrect because the atomic number of an element is equal to the number of protons in an atom of that element. C is correct because the number of neutrons is equal to the mass number minus the number of protons. D is incorrect because the number of electrons in an atom is the same as the number of protons, so element 1 has 10 electrons and element 2 has 9 electrons.. DIF: Cognitive Complexity: Medium Complexity Student Level: Average Depth of Knowledge 2: Basic Application of Skill Bloom's Traditional: Application Bloom's Revised: Understanding REF: 50e911c4-e685-11de-9c f0d2ea TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom. KEY: atomic number mass number atoms MSC: Florida FCAT Preparation Uses visual element g8_unit6_unit Test B IN g8 ISTEP+ Practice 1 3. ANS: A A is correct because A points to the center of the atom, called the nucleus, which contains the protons and neutrons. B is incorrect because B points to a neutron. C is incorrect because C points to a proton.
6 D is incorrect because D points to the electron cloud. Knowledge 1: Recall Bloom's Traditional: Comprehension Bloom's Revised: Remembering REF: 50eb741f-e685-11de-9c f0d2ea TOP: The Parts of the Atom: Identify the nucleus and electron cloud in a model of an atom. KEY: atoms nucleus atom model MSC: Test Generator Uses visual element IN g8_u2 Unit Test B 4. ANS: A A is correct because an atom is the smallest particle of an element that has the chemical properties of that element. B is incorrect because a proton from a calcium atom is smaller than an atom and does not have the same chemical properties of calcium. C is incorrect because an electron from a calcium atom is smaller than the atom itself and does not have the same chemical properties of calcium. D is incorrect because a molecule that contains calcium is larger than an atom of calcium and would have different properties than calcium. Knowledge 1: Recall Bloom's Traditional: Knowledge Bloom's Revised: Remembering REF: 50feae07-e685-11de-9c f0d2ea TOP: Atomic Theory: Define atom. KEY: atoms atomic theory electrons nucleus property MSC: g8_unit6 Lesson Quiz IN g8_u2 Lesson4 Quiz 5. ANS: C A is incorrect because water is made up of molecules that contain more than one atom. B is incorrect because an electron cloud is only part of an atom. Water molecules are made up of combinations of whole atoms. C is correct because water is made up of molecules that contain hydrogen and oxygen atoms. D is incorrect because protons and neutrons make up the nucleus of an atom, and water molecules are made up of combinations of whole atoms. DIF: Cognitive Complexity: Medium Complexity Student Level: Average Depth of Knowledge 2: Basic Application of Skill Bloom's Traditional: Comprehension Bloom's Revised: Understanding REF: 5100e952-e685-11de-9c f0d2ea TOP: Atomic Theory: Describe the atomic theory. KEY: atomic theory atoms electron cloud neutron protons MSC: Florida Benchmark Review Preparation IN g8_u2 Unit Test A 6. ANS: D
7 A is incorrect because a nucleus has a positive charge. B is incorrect because an electron is significantly smaller than a nucleus. C is incorrect because the nucleus of some atoms may be different sizes, depending on which element it is. D is correct because neutrons and protons make up the nucleus. Knowledge 1: Recall Bloom's Traditional: Knowledge Bloom's Revised: Remembering REF: 51034bad-e685-11de-9c f0d2ea KEY: nucleus atoms neutron protons MSC: Test Generator 7. ANS: C A is incorrect because the mass of a proton is almost 2,000 times greater than the mass of an electron. B is incorrect because the electron cloud includes only electrons. C is correct because the electron cloud is where all the electrons in the atom are located. D is incorrect because the nucleus is in the center of an atom, and the electron cloud surrounds the nucleus. Knowledge 1: Recall Bloom's Traditional: Knowledge Bloom's Revised: Remembering REF: bd-e685-11de-9c f0d2ea KEY: electron cloud electrons atoms MSC: Test Generator 8. ANS: B A is incorrect because the atomic number of protons is not the neutrons minus the protons. B is correct because the atomic number is the same as the number of protons. C is incorrect because the atomic number is not the number of neutrons. D is incorrect because the atomic number of protons is not the number of protons plus the number of neutrons. Knowledge 1: Recall Bloom's Traditional: Comprehension Bloom's Revised: Remembering REF: 5105ae08-e685-11de-9c f0d2ea TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom. KEY: protons neutron atomic number MSC: Florida FCAT Preparation
8 9. ANS: D A is incorrect because people already knew that atoms are too small to see. B is incorrect because nothing can be concluded about an atom s charge from the experiment. C is incorrect because the experiment s results do not support the conclusion that atoms are composed of metal. D is correct because the fact that atoms could pass through the thin metal mostly undeflected showed that they were mostly empty space. DIF: Cognitive Complexity: High Complexity Student Level: Advanced Depth of Knowledge 1: Recall Bloom's Traditional: Synthesis and Evaluation Bloom's Revised: Analyzing REF: e685-11de-9c f0d2ea TOP: Atomic Theory: Describe the atomic theory. KEY: atoms atomic theory early atom model MSC: Florida FCAT Preparation 10. ANS: D A is incorrect because the mass of an electron can be found despite its speed. B is incorrect because electric charge does not affect mass. C is incorrect because the atomic number represents the number of protons in an atom. D is correct because electrons have a mass that is a very small fraction of the mass of a proton, so its mass is negligible compared to the mass of the rest of the atom. DIF: Cognitive Complexity: Medium Complexity Student Level: Average Depth of Knowledge 2: Basic Application of Skill Bloom's Traditional: Comprehension Bloom's Revised: Understanding REF: e685-11de-9c f0d2ea KEY: atoms mass number atomic number electrons MSC: g8_unit6 Lesson Quiz IN g8_u2 Lesson4 Quiz 11. ANS: A A is correct because a neutron and proton are about the same mass; together their masses make up the atomic mass. B is incorrect because the mass of a proton is about 2,000 times as great as the mass of an electron. C is incorrect because a neutron is part of the nucleus. D is incorrect because an electron has less mass than either a neutron or proton, and the nucleus is made up of both protons and neutrons. So, the mass of an electron is much less than the mass of a nucleus.. DIF: Cognitive Complexity: Low Complexity Depth of Knowledge 2: Basic Application of Skill Student Level: Average Bloom's Traditional: Analysis Bloom's Revised:
9 Analyzing REF: 510cd519-e685-11de-9c f0d2ea KEY: atoms neutron electrons protons nucleus mass MSC: Test Generator 12. ANS: B A is incorrect because the Thomson model does not show an electron cloud surrounding a nucleus.. B is correct because the Thomson model shows negative charges and positive charges. C is incorrect because the Thomson model shows positive charge throughout, and the current model shows positive charges grouped together in the nucleus at the center of the atom. D is incorrect because the Thomson model shows the mass of the atom spread throughout the atom. DIF: Cognitive Complexity: High Complexity Student Level: Advanced Depth of Knowledge 3: Strategic Thinking Bloom's Traditional: Application Bloom's Revised: Applying REF: CD200D21-476B-4DF8-88BD-DC0C6D807C99 OBJ: G6_PC_85260_TheAtom KEY: atoms atomic theory model MSC: Uses visual element IN g8_u2 Unit Test B SHORT ANSWER 1. ANS: Sample answer: We now know that protons and neutrons make up a part of the atom called the nucleus, which is a mass in the center of an atom. However, the concept of an electron cloud is similar to Thomson s model, in which negatively charged particles are spread throughout the atom. Students answers should include: Our understanding of the atom is different from Thomson s because we now know that protons and neutrons make up a part of the atom called the nucleus. Our understanding of the atom is similar to Thomson s because his model included electrons. DIF: Cognitive Complexity: Medium Complexity Student Level: Average Depth of Knowledge 2: Basic Application of Skill Bloom's Traditional: Comprehension Bloom's Revised: Understanding REF: 510f3774-e685-11de-9c f0d2ea
10 TOP: Atomic Theory: Describe the atomic theory. The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and electrons in an atom. KEY: atoms atomic theory atom model MSC: Test Generator Uses visual element g8_unit6_unit Test B 2. ANS: Key Elements: A. nucleus; B. neutron; C. proton; D. electron cloud AND The diagram shows an atom that has 3 protons. Because the atomic number of an atom is equal to the number of protons in the atom (3 for lithium), the diagram can be recognized as representing lithium. Rubric: 2 points Two key elements 1 point One key element 0 point Other DIF: Cognitive Complexity: Low Complexity Depth of Knowledge 1: Recall Bloom's Traditional: Knowledge Bloom's Revised: Remembering Student Level: Basic REF: F96D93CA-3E DF-024B1A1C7B68 OBJ: G6_PC_85260_TheAtom KEY: atoms atomic number mass number MSC: IN g8_u2 Unit Test A
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