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52 Chemistry: Matter and Change
Solving Problems: A Chemistry Handbook
SOLVING PROBLEMS:
A CHEMISTRY HANDBOOK
CHAPTER
5
23. Identify the elements that have the following electron
configurations.
a. [He]2s 2 2p 5
b. [Ar]4s 2 3d 5
c. [Ar]4s 2 3d 10 4p 2
d. [Ne]3s 1
e. [Kr]5s 1 4d 8
f. [Xe]6s 2 4f 14 5d 10 6p 4
g. 1s 2 2s 2 2p 6 3s 2 3p 4
h. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10
24. What electrons do the dots in an electron-dot structure
represent? Why are these electrons important?
25. List three elements that have the electron-dot structure
.
X