Multiple Choice
Which of the following is the correct electron configuration for chlorine (atomic number 17)?
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10. Periodic Properties of the Elements
The Electron Configuration
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In an atom, where are the electrons with the highest energy typically located?
A
In the nucleus
B
In the outermost (highest principal quantum number) shell
C
In the 1s orbital
D
In the innermost (lowest principal quantum number) shell
Verified step by step guidance1
Understand that electrons in an atom are arranged in shells or energy levels, each characterized by a principal quantum number \( n \).
Recognize that the principal quantum number \( n \) increases as you move farther from the nucleus, and higher \( n \) corresponds to higher energy levels.
Recall that electrons in the innermost shell (lowest \( n \)) are closer to the nucleus and have lower energy compared to those in outer shells.
Identify that the electrons with the highest energy are those in the outermost shell, which has the highest principal quantum number \( n \).
Conclude that these outermost electrons are typically responsible for chemical reactions and bonding because they have the highest energy and are least tightly held by the nucleus.
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