Atoms: Homework Help 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 did Rutherford discover in his gold foil experiment?

Question 2 2. Why should you avoid looking directly at magnesium burning?

Question 3 3. Which of the following sets of quantum numbers CAN exist?

Question 4 4.

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

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Question 6 6.

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

Question 8 8. What is the largest principal quantum number that a calcium electron can have?

Question 9 9. Who first coined the term atom, meaning indivisible?

Question 10 10. Magnesium has three common isotopes. Based on its average atomic mass, which is the most common?

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Question 11 11. Which is the symbol for the element that contains six electrons in each of its neutral atoms?

Question 12 12. The nucleus of an atom:

Question 13 13. Which letter orbital corresponds to l = 2?

Question 14 14. What should the electron configuration for neon (Ne) end with? Is it going to be a stable atom or a reactive atom?

Question 15 15.

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.)

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Question 16 16. The mass number indicates:

Question 17 17. X and Y are elements that are isotopes to each other. Which of the following is true about X and Y?

Question 18 18. Which element has a mass number of 12 and contains 6 neutrons?

Question 19 19. A tenth of a mole of pennies contains how many pennies?

Question 20 20. When writing electron configurations, electrons are represented in their lowest possible energy state, called their _____.

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Question 21 21. The average atomic mass or atomic weight found on the periodic table is _____.

Question 22 22. What is the principal quantum number for the last electron that is added to potassium?

Question 23 23. When an electron moves from an excited state to a ground state, it will _____.

Question 24 24. What is the correct electron configuration for an atom of sodium (Na)?

Question 25 25. ALL atoms of the same element have:

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Question 26 26. Which of the following is an example of when an electron absorbs energy?

Question 27 27. Which block is manganese (Mn) located in?

Question 28 28. Which scientist is credited with discovering the charge of individual electrons?

Question 29 29. How are isotopes of the same element similar?

Question 30 30. 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?

Atoms: Homework Help 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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