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Atoms: Help and Review Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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Question 1 1.

A piece of aluminum foil has a mass of 27 grams. About how many atoms does this contain?

(Aluminum has a molecular mass of 27 g/mol.)

Question 2 2. Which is the symbol for the element that contains six electrons in each of its neutral atoms?

Question 3 3. A tenth of a mole of pennies contains how many pennies?

Question 4 4. Magnesium has three common isotopes. Based on its average atomic mass, which is the most common?

Question 5 5. What is the principal quantum number for the last electron that is added to potassium?

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Question 6 6. Which scientist is credited with discovering the charge of individual electrons?

Question 7 7. Which letter orbital corresponds to l = 2?

Question 8 8. When an electron moves from an excited state to a ground state, it will _____.

Question 9 9. The nucleus of an atom:

Question 10 10. The mass number indicates:

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Question 11 11. Which of the following sets of quantum numbers CAN exist?

Question 12 12. What did Rutherford discover in his gold foil experiment?

Question 13 13.

A computer chip contains 1.20 x 10^23 atoms of silicon. What is its mass?

(The molecular mass of silicon is 28 g/mol.)

Question 14 14. ALL atoms of the same element have:

Question 15 15. Which of the following was the instrument used for the discovery of the electron?

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Question 16 16. What should the electron configuration for neon (Ne) end with? Is it going to be a stable atom or a reactive atom?

Question 17 17. Why should you avoid looking directly at magnesium burning?

Question 18 18.

A piece of copper wire contains 5 moles of copper atoms. What is its mass?

(The molecular mass of copper is 63.5 g/mol.)

Question 19 19. If Atom #1 has 19 protons and 22 neutrons, and Atom #2 has 20 protons and 22 neutrons, are these isotopes of the same element?

Question 20 20. What is the maximum number of electrons that can be found in a 5p cluster (or orbital) of a single atom?

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Question 21 21. What is the largest principal quantum number that a calcium electron can have?

Question 22 22.

A piece of pencil graphite (made of carbon atoms) has a mass of 0.12 grams. How many moles of carbon atoms are in the lead?

(The molecular mass of carbon is 12 g/mol.)

Question 23 23. The Bohr model of the atom:

Question 24 24. When writing electron configurations, electrons are represented in their lowest possible energy state, called their _____.

Question 25 25. Why did Democritus disagree with Aristotle?

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Question 26 26. Which quantum number indicates the position of the orbital?

Question 27 27. How many neutrons does the most common isotope of hydrogen have?

Question 28 28. What is the correct electron configuration for an atom of sodium (Na)?

Question 29 29. X and Y are elements that are isotopes to each other. Which of the following is true about X and Y?

Question 30 30. Which block is manganese (Mn) located in?

Atoms: Help and Review Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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