Unit 3 – Electrons/PT Exam Review

1.What is the next atomic orbital in the series: 1s, 2s, 2p, 3s, 3p, ? A. 3d B. 4s C. 4p D. 3f

2. In Bohr’s model of the atom, where are the electrons? A. Evenly throughout the entire atom. B. In orbitals. C. In orbits. D. His model did not include electrons.

3. What is the approximate energy of a photon having a frequency of 4.0 x Hz? (h = 6.63 x J. s) A. 1.7 x J B x J C x J D. 2.7 x J

4. How many unpaired electrons are in a sulfur atom? A. 4 B. 1 C. 2 D. 0

5. According to the Heisenberg uncertainty principle, if the position of a moving particle is known, what other quantity CANNOT be known? A. energy B. momentum C. mass D. none of the above

6. Which of the following has the highest frequency: A. x-rays B. gamma rays C. radio waves D. UV rays

7. What is the electron configuration of potassium? A. [Ar]4s 1 B. [Ne]4s 1 C. 1s 1 2s 1 2p 6 3p 6 D. 1s 2 2p 6 3s 2 3p 6 4s 1

8. What is the number of electrons in the outermost energy level of an oxygen atom? A. 4 B. 6 C. 8 D. 10

9. The principal (quantum) number indicates what property of an electron? A. the energy level of the electron B. the spin of the electron C. the sublevel of the electron D. the shape of the orbital

10. What is the maximum number of electrons in the second principal energy level? A. 2 B. 8 C. 18 D. 32

11. If three electrons are available to fill three empty 2p atomic orbitals, how will the electrons be distributed? A. All in one orbital B. 2 of them will be in one orbital; 1 in another C. 1 electron in each orbital D. they can’t all fit in the 2p orbitals

12. What types of atomic orbitals (s, p, d, or f) are in the third principal energy level? A. s and p B. s, p, and f C. s, p, and d D. s, p, d, and f

13. How many energy sublevels are in the second principal energy level? A. 1 B. 2 C. 3 D. 4

14. Emission of light from an atom occurs when an electron _____. A. moves from a lower to higher energy level B. moves from a higher to lower energy level C. releases a photon D. both b and c

15. What is the maximum number of “d” orbitals in a principal energy level? A. 1 B. 3 C. 5 D. 7

16. How are frequency and wavelength of light related? A. directly proportional B. inversely proportional C. the have no relation

17. Which color of visible light has the shortest wavelength? A. red B. blue C. indigo D. violet

18. Which of the following groupings contains only representative elements: A.Cu, Co, Cd B.Al, Mg, Li C. Fe, Na, Pb D. Ne, Kr, Ti

19. What is true about the electron configurations of the representative elements? A. s and p sublevels filled or filling B. s, p, and d sublevels filling C. s, p, d, and f sublevels filling D. Filled d sublevel

20. Which of the following elements is a halogen? A. Na B. Ca C. Ar D. F

21. The modern periodic table is arranged according to _____. A. Atomic number B. Atomic mass C. Groups having similar chemical properties D. Both A & C

22. Which of the following elements is a nonmetal A. Fe B. Ga C. C D. Hg

23. What is another name for the transition metals? A. Group A elements B. Group B elements C. Lanthanides D. Actinides

24. Which of the following elements is a transition metal: A. Copper B. Cesium C. I odine D. Aluminum

A. Decrease in shielding B. Increase in shielding C. Decrease in nuclear charge D. Increase in nuclear charge 25. What is the factor that contributes to the increase in ionization energy from left to right across a period?

26. What element in the second period has the largest atomic radius? A. Li B. Be C. F D. O

27. Which of the following elements is in the same period as phosphorus: A. Nitrogen B. Antimony C. Krypton D. Argon

28. Which subatomic particle plays the greatest part in determining the properties of an element? A. Proton B. Neutron C. Electron D. All of the above

29. How does atomic radius change from left to right across a period in the periodic table? A. It increases B. It decreases C. It remains the same

30. How does atomic radius change from top to bottom in a group in the periodic table? A. It increases B. It decreases C. It remains the same

31. As you move from left to right across the second period of the periodic table, ionization energy __. A. Increases B. Decreases C. Remains the same

32. What is the energy required to remove an electron from an atom in the gaseous state called? A. Electron affinity B. Electronegativity C. Ionization energy D. Ionic size

33. Each period in the periodic table corresponds to ____. A. A vertical column of elements B. A horizontal row of elements C. A family of elements

34. Which of the following elements has the smallest first ionization energy: A. Si B. Ge C. P D. As

35. How many electrons are there in the highest occupied energy level of atoms in Group 5A elements? A. 15 B. 5 C. 7 D. 33

ANSWERS 1. B11. C21. D31. A 2.C12. C22. C32. C 3. D13. D23. B33. B 4. C14. D24. A34. B 5. B15. C25. D35. B 6. B16. B26. A 7. A17. D27. D 8. B18. B28. C 9. A19. A29. B 10. B20. D30. A