Scelta multipla
In its ground state, how many occupied electron shells does a neutral sodium atom (Na) have?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Shells
Scelta multipla
Which of the following shell number values is a possible value for the element highlighted?
A
n = 10
B
n = 4
C
n = 6
D
n = 7
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Identify the element highlighted in the periodic table. The element is Selenium (Se).
Determine the period number of Selenium. Selenium is located in the fourth row of the periodic table, which corresponds to period 4.
Understand that the period number corresponds to the principal quantum number (n) for the outermost shell of electrons in an atom of the element.
Recognize that the principal quantum number (n) indicates the shell number where the outermost electrons reside. For Selenium, this is n = 4.
Conclude that the possible shell number value for Selenium, based on its position in the periodic table, is n = 4.
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