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The Atom & Structure of Elements 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!

Page 1

Question 1 1. An element is defined by the number of:

Question 2 2. Particles that are found in the atomic nucleus are:

Question 3 3. If only one type of atom makes up a substance, what can you call this substance?

Question 4 4. What does the atomic number represent?

Question 5 5. Which of the following has a positive charge and a mass of one amu?

Page 2

Use this material to answer questions #6 through #10

periodic table

Question 6 6. How many valence electrons does silicon have?

Use this material to answer questions #6 through #10

periodic table

Question 7 7. How many valence electrons does krypton have?

Use this material to answer questions #6 through #10

periodic table

Question 8 8. Which of the following elements has the same number of valence electrons as aluminum?

Use this material to answer questions #6 through #10

periodic table

Question 9 9. In which energy level is the outer electron in rubidium located?

Use this material to answer questions #6 through #10

periodic table

Question 10 10. Which element in the second column is likely to be the most reactive?

Page 3

Question 11 11. Which element has a mass number of 12 and contains 6 neutrons?

Question 12 12. 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 13 13. ALL atoms of the same element have:

Question 14 14. The nucleus of an atom:

Question 15 15. The mass number indicates:

Page 4

Question 16 16. Molecular weight is also called _____.

Question 17 17. Where can you find the atomic mass of an element?

Question 18 18. The first thing you need to do when calculating molecular weight is to ______ the number of each type of atom and the atomic mass for that atom.

Question 19 19. The second thing you need to do when calculating molecular weight is to ______ all of the total masses of each element in the molecule.

Question 20 20. Determine the molecular weight of methane, which has the molecular formula CH4. The atomic mass of C is 12.01 amu and the atomic mass of H is 1.008 amu.

The Atom & Structure of Elements 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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