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By Glenn V. Lo, Michael A. Janusa

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In this magnified world, the ­diameter of a typical electron cloud would be at least 1000 cm and each individual ­electron would be a tiny speck. Put another way, if you put two atoms “side by side,” the distance between the nuclei would be at least 1000 times larger than the diameter of the nuclei themselves. ­Between the nuclei, where electrons are roaming about, is mostly ­empty space, which would be at least 1,000,000,000 times larger than the space actually ­occupied by the nuclei. 5 cm. If the nuclei of two neighboring atoms were the size of tennis balls, how far away from each other would the nuclei be?

5 6. To how many significant figures should the result of the following calculation be reported? 2500 mL + 25 mL? A. 2 B. 3 C. 4 D. 5 26 Chemistry: The Core Concepts 7. How should the result of the following calculation be reported? 0 mL ? A. 8 g/mL B. 0 g/mL C. 00 g/mL D. 000 g/mL 8. How should the result of the following calculation be reported? 010 s A. 80 m/s B. 0 m/s C. 0×101 m/s D. 8×101 m/s 9. How should the result of the following calculation be reported? 0)? A. 20 B. 21 C. 202 D. 2022 10.

0 u. 0 u. 6 Mass of Atoms ▼ We cannot get the most precise value for the mass of an atom by simply adding the precise masses of protons, neutrons, and electrons that make it up. The actual mass of an atom is slightly different and needs to be looked up. The discrepancy is called the mass defect (m) and is related to the binding energy (E), the energy needed to separate all protons and neutrons from one another, according to Einstein’s equation: E = mc2. 998 × 108 m/s. 9991603 u 18 O? Chapter 3: Atoms, Ions, and Molecules 33 We have to look up this number.

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