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Questions for Regents Practice Atomic Structure
Answers Topic 3

1. 2 14. 2 27. (.909 x 20) + (.003 x 21) + (.088 x 22)
setup may vary
2. 4 15. 2

3. 4 16. 4
28. 20
4. 3 17. 1

5. 1 18. 2 29. They contain different number of neutrons.

6. 4 19. 2
30. Spectrum is produced when excited e- returned
7. 1 20. 1 to ground state. (answer may vary)

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8. 1 21. 1
31. He and H
9. 1 22. 2

10. 2 23. 4 32 2 – 8 – 1 – 1 or 2 – 7 – 3
(configuration may vary, BUT must have 12 electrons)
11. 3 24. 1

12. 1 25. 3 33. 2

13. 1 26. 2

Additional Materials Answers to Questions

34) 2 43) Atoms 44) n = 1 : -2.178 x 10 -18 J

C: 1s 2s 2p -19
4
2
2
35) 3 n = 2 : -5.45 x 10 J

Al: 1s 2s 2p 3s 3p n = 3: -2.42 x 10 J
1
2
2
6
2
-19

36) 2 S : 1s 2s 2p 3s 3p
2
2
4
2
6
45) 7.32 x 10 Hz
19
2
2
6
6
2
37) 3 Ar: 1s 2s 2p 3s 3p
14
46) 4.73 x 10 Hz
2
2
6
2
6
2
Ca: 1s 2s 2p 3s 3p 4s
38) 1 47) 3.75 x 10 meters
-7

2
2
2
10
2
4
Se: 1s 2s 2p 3s 3p 3d 4S 4p
6
6

-7
39) 2 48) 4.99 x 10 meters
Ions

-19
49) 5.64 x 10 Joules
+
40) 1 Li : 1s
2
-13
6
2
2
Mg : 1s 2s 2p 50) 3.33 x 10 Joules
2+
41) 2
51) 3.10 x 10 Joules
-19
2
6
+
2
K : 1s 2s 2p 3s 3p
2
6
42) 3

F- : 1s 2s 2p 6 52) 4.89 x 10 Joules
2
2
-15

6
2
2
6
2
2-
S : 1s 2s 2p 3s 3p 53) 2.78 meters

2
6
6
6
2
2
3-
10
2
As : 1s 2s 2p 3s 3p 3d 4s 4p

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