Multiple Choice
In an atom, where are the lowest electron energy levels located?
3
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10. Periodic Properties of the Elements
The Electron Configuration
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many electron shells are present in a neutral cesium (Cs) atom?
A
7
B
6
C
4
D
5
Verified step by step guidance1
Identify the atomic number of cesium (Cs) from the periodic table, which is 55. This tells us that a neutral cesium atom has 55 electrons.
Recall that electron shells correspond to the principal quantum number (n), which indicates the main energy levels around the nucleus where electrons reside.
Determine the period (row) of cesium in the periodic table. Cesium is located in period 6, which means its electrons occupy up to the 6th electron shell.
Understand that the number of electron shells in a neutral atom equals the period number of the element in the periodic table.
Conclude that a neutral cesium atom has 6 electron shells because it is in period 6.
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