Multiple Choice
Which of the following is the correct electron configuration for the arsenide ion, As^{3-}?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which principal energy level is associated with the elements in the fifth row of the periodic table?
A
n = 5
B
n = 4
C
n = 3
D
n = 6
Verified step by step guidance1
Understand that the principal energy level, denoted by the quantum number $n$, corresponds to the main electron shell occupied by electrons in an atom.
Recall that the rows (periods) of the periodic table correspond to the filling of successive principal energy levels.
Identify that the first row corresponds to $n=1$, the second row to $n=2$, and so on, because each row represents the filling of a new principal energy level.
Recognize that the fifth row of the periodic table corresponds to the principal energy level $n=5$ because it is the fifth period, indicating electrons are filling the fifth shell.
Therefore, the principal energy level associated with elements in the fifth row is $n=5$.
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