Unit 2 - Study Guide
Directions: Solve each question in your Science Notebook, then study your answers for the quiz.
1. How many valence electrons are in a neutral strontium atom?
2. Which group of elements on the periodic table are known as the alkali metals?
3. Draw the Bohr model and write the electron configuration for a neutral atom of selenium.
4. Draw the Bohr model, and write the electron configuration for chromium.
5. Which group on the periodic table is known as the noble gases?
6. What can you predict about the properties of xenon and helium, both in Group 18 in the periodic table? Why?
7. What is the total number of subatomic particles in the nucleus of an atom of Bi?
8. What is the atomic number for an element with 41 neutrons and a mass number of 80?
9. An element has an atomic number of 80. How many protons and electrons are in an atom of the element?
10. Use the periodic table to determine the number of electrons in a neutral atom of lithium.
11. The molar mass of copper is 63.55 g/mol, the molar mass of sulfur is 32.07 g/mol, and the molar mass of oxygen is 16.00
g/mol. Calculate the percent composition of copper(II) sulfate, CuSO4.
12. Use the periodic table to determine the number of protons in an atom of barium.
13. The molar mass of aluminum is 26.98 g/mol and the molar mass of fluorine is 19.00 g/mol. Calculate the total molar mass
and percent composition of aluminum trifluoride, AlF3.
14. Calculate the number of neutrons in Pb.
15. In terms of the periodic law, explain which two of these elements are most similar: sodium (element 11), phosphorus
(element 15), and sulfur (element 16).
16. Why do most atoms form chemical bonds?
17. How many protons are present in an atom of Be-9?
18. Explain how Dalton improved upon atomic theory more than 2000 years after Democritus’s hypotheses about atoms.
19. What is the mass number for an oxygen atom that has 10 neutrons in its nucleus?
20. How many valence electrons are in an atom of magnesium?
21. Explain how ions form. Provide Bohr model examples.
22. What is the relative charge of a proton?
Use the periodic table to answer the following questions.
23. Which element has the following electron configuration: [Ar] 4s2 3d10 4p5?
24. Write the noble-gas electron configuration for silicon.
25. The molar mass of iron is 55.85 g/mol, the molar mass of silicon is 28.08 g/mol, and the molar mass of oxygen is 16.00
g/mol. Calculate the percent composition of iron(II) silicate, Fe2SiO4.
26. The electron configuration for nitrogen is 1s2 2s2 2p3. What does the 3 in 2p3 mean?
27. Determine the number of electrons in an atom of iridium.
28. How many electrons are in an atom of gold?
29. How many electrons does the ion Ca contain?
30. What observations by Rutherford led to the hypothesis that atoms are mostly empty space, and that almost all of the
mass of the atom is contained in an atomic nucleus?
31. How many electrons are in a rubidium ion (Rb)?
32. Use the periodic table to determine the number of neutrons in nitrogen-14.
33. What is a positive ion called?
34. How many neutrons are present in an atom of the isotope U?
35. Draw the Bohr model and describe how many valence electrons are in bromine?
36. What is the difference between ionic and covalent bonding?
1. How many valence electrons are in a neutral strontium atom?
2. Which group of elements on the periodic table are known as the alkali metals?
3. Draw the Bohr model and write the electron configuration for a neutral atom of selenium.
4. Draw the Bohr model, and write the electron configuration for chromium.
5. Which group on the periodic table is known as the noble gases?
6. What can you predict about the properties of xenon and helium, both in Group 18 in the periodic table? Why?
7. What is the total number of subatomic particles in the nucleus of an atom of Bi?
8. What is the atomic number for an element with 41 neutrons and a mass number of 80?
9. An element has an atomic number of 80. How many protons and electrons are in an atom of the element?
10. Use the periodic table to determine the number of electrons in a neutral atom of lithium.
11. The molar mass of copper is 63.55 g/mol, the molar mass of sulfur is 32.07 g/mol, and the molar mass of oxygen is 16.00
g/mol. Calculate the percent composition of copper(II) sulfate, CuSO4.
12. Use the periodic table to determine the number of protons in an atom of barium.
13. The molar mass of aluminum is 26.98 g/mol and the molar mass of fluorine is 19.00 g/mol. Calculate the total molar mass
and percent composition of aluminum trifluoride, AlF3.
14. Calculate the number of neutrons in Pb.
15. In terms of the periodic law, explain which two of these elements are most similar: sodium (element 11), phosphorus
(element 15), and sulfur (element 16).
16. Why do most atoms form chemical bonds?
17. How many protons are present in an atom of Be-9?
18. Explain how Dalton improved upon atomic theory more than 2000 years after Democritus’s hypotheses about atoms.
19. What is the mass number for an oxygen atom that has 10 neutrons in its nucleus?
20. How many valence electrons are in an atom of magnesium?
21. Explain how ions form. Provide Bohr model examples.
22. What is the relative charge of a proton?
Use the periodic table to answer the following questions.
23. Which element has the following electron configuration: [Ar] 4s2 3d10 4p5?
24. Write the noble-gas electron configuration for silicon.
25. The molar mass of iron is 55.85 g/mol, the molar mass of silicon is 28.08 g/mol, and the molar mass of oxygen is 16.00
g/mol. Calculate the percent composition of iron(II) silicate, Fe2SiO4.
26. The electron configuration for nitrogen is 1s2 2s2 2p3. What does the 3 in 2p3 mean?
27. Determine the number of electrons in an atom of iridium.
28. How many electrons are in an atom of gold?
29. How many electrons does the ion Ca contain?
30. What observations by Rutherford led to the hypothesis that atoms are mostly empty space, and that almost all of the
mass of the atom is contained in an atomic nucleus?
31. How many electrons are in a rubidium ion (Rb)?
32. Use the periodic table to determine the number of neutrons in nitrogen-14.
33. What is a positive ion called?
34. How many neutrons are present in an atom of the isotope U?
35. Draw the Bohr model and describe how many valence electrons are in bromine?
36. What is the difference between ionic and covalent bonding?