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

Question 2 2. Magnesium has three common isotopes. Based on its average atomic mass, which is the most common?

Question 3 3. Which of the following is an example of when an electron absorbs energy?

Question 4 4.

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 5 5. Which quantum number indicates the position of the orbital?

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Question 6 6. Which of the following was the instrument used for the discovery of the electron?

Question 7 7. Why should you avoid looking directly at magnesium burning?

Question 8 8.

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 9 9.

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 10 10. 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?

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Question 11 11. What should the electron configuration for neon (Ne) end with? Is it going to be a stable atom or a reactive atom?

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

Question 13 13. The nucleus of an atom:

Question 14 14. Which of the following sets of quantum numbers CAN exist?

Question 15 15. Which element has a mass number of 12 and contains 6 neutrons?

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Question 16 16. Which letter orbital corresponds to l = 2?

Question 17 17. The average atomic mass or atomic weight found on the periodic table is _____.

Question 18 18. The Bohr model of the atom:

Question 19 19. Who first coined the term atom, meaning indivisible?

Question 20 20. A tenth of a mole of pennies contains how many pennies?

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Question 21 21. When writing electron configurations, electrons are represented in their lowest possible energy state, called their _____.

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

Question 24 24. What is the largest principal quantum number that a calcium electron can have?

Question 25 25. How many neutrons does the most common isotope of hydrogen have?

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Question 26 26. Which is the symbol for the element that contains six electrons in each of its neutral atoms?

Question 27 27. What is the correct electron configuration for an atom of sodium (Na)?

Question 28 28. Why did Democritus disagree with Aristotle?

Question 29 29. What is the maximum number of electrons that can be found in a 5p cluster (or orbital) of a single atom?

Question 30 30. The mass number indicates:

Atom 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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