Question

Consider a simplified model of a triply ionized beryllium-9 atom (Be^1+): four protons plus five neutrons in the atom's nucleus, "orbited" by just one electron at a constant distance of 4.50 times 10^-12 m. You can solve (a) & (b) in either order. Label your work clearly: a. What is the strength (magnitude) of the attractive electric force between the nucleus and the electron? Show your work. b. What is the magnitude of the electric field at the electron's location? Is its direction toward or away from the nucleus? Show your work. c. What is the strength (magnitude) of the attractive gravitational force between the nucleus and the electron? (Recall: F_o = G m_1 m_2/r^2) Show your work. d. For this particular nucleus and orbiting electron, how many times stronger is the electric force in part (a) than the gravitational force in part (c)? Divide and find out: (You do NOT need to show your work.) F_F/F_G Thought question (nor for credit): When chemists deal with the interaction forces between atoms, is it valid for them to consider only electrical forces (ionic bonds, hydrogen bonds, dipole interactions, van der Waals forces, etc.) while ignoring gravitational forces?

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

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Answer 6

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Answer 7

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Answer 8

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Answer 9

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