Second Six Weeks Reteach Assessment
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1 Second Six Weeks Reteach ssessment Grade 8 Science Student Name
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4 8th Science 3rd 6 Weeks Reteach ssessment 8.5 Name lass/grade ate 1 J.J. Thomson is known for his discovery of the electron in Thomson's discovery led him to create a model of an atom called the plum pudding model. The diagram below shows the plum pudding model. Today, the plum pudding model is considered an inaccurate representation of an atom because an atom contains a positively charged central core with electrons moving around the outside of the central core. negatively charged central core with protons moving around the outside of the central core. positively charged central core with neutrons moving around the outside of the central core. negatively charged central core with electrons moving around the outside of the central core Progress Testing Page 1
5 8th Science 3rd 6 Weeks Reteach ssessment 8.5 irections: The diagram below shows the structure of an atom. Use the picture and your knowledge of science to answer any questions that follow. 2 Which of these best describes the subatomic particle Y in the diagram? Particle Y has a negative charge and no mass. Particle Y has a positive charge and the same mass as the particles located at X. Particle Y has no charge and greater mass than the particles located at X. Particle Y has a negative charge and less mass than the particles located at X Progress Testing Page 2
6 8th Science 3rd 6 Weeks Reteach ssessment Ernest Rutherford directed the famous gold foil experiment by using a thin piece of gold foil and shooting alpha particles, particles with two protons and two neutrons bound together, at the gold foil. The diagram below shows the results of Rutherford's experiment. The deflection of some of the alpha particles revealed that the structure of an atom is composed of a central core that has a high density with a negative charge. low density with a positive charge. high density with a positive charge. low density with a negative charge Progress Testing Page 3
7 8th Science 3rd 6 Weeks Reteach ssessment Electrons in an atom are arranged in layers, or shells. For example, an atom of titanium has two electrons in its innermost electron shell. The next two layers contain eight and ten electrons, and the outermost layer contains two electrons. What does the number of electrons in the outermost shell of an element indicate? 5 The diagram below shows an atom of an element from the periodic table. What state of matter an element is usually found in Whether an element is radioactive How many protons and neutrons are in an atom Whether an element is likely to bond with other elements This atom is mostly likely potassium, which can react and bond with chlorine. flourine, which can react and bond with calcium. beryllium, which can react and bond with oxygen. boron, which can react and bond with magnesium Progress Testing Page 4
8 8th Science 3rd 6 Weeks Reteach ssessment 8.5 irections: The diagram below shows a portion of the periodic table. Use the diagram and your knowledge of science to answer any questions that follow. 6 Which number can be used to draw a model of an atom in order to determine the atom's reactivity? The number Y, because it represents the number of protons in an atom, which equals the number of electrons in an atom The number X, because it represents the number of protons in an atom, which equals the number of electrons in an atom The number Y, because it represents the number of electrons in an atom, which equals the number of neutrons in an atom The number X, because it represents the number of neutrons in an atom, which equals the number of protons in an atom Progress Testing Page 5
9 8th Science 3rd 6 Weeks Reteach ssessment 8.5 irections: The diagram below shows the structure of a certain atom. Use the diagram and your knowledge of science to answer any questions that follow. 7 The atom in the diagram is barium. sulfur. oxygen. chromium. 8 Which of the following can be used to identify the atom in the diagram? The number of particle Y, if Y is a neutron The number of particle X, if X is a proton The sum of particles W, X, and Y The sum of particles W and X, only Progress Testing Page 6
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