Multiple Choice
How many valence electrons does tin (Sn) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following groups of elements have their valence electrons within the same principal energy level?
A
Elements with the same number of neutrons
B
Elements with similar atomic numbers
C
Elements in the same group
D
Elements in the same period
Verified step by step guidance1
Understand that the principal energy level corresponds to the main electron shell number (n), which indicates the energy level where valence electrons reside.
Recall that elements in the same period (horizontal row) of the periodic table have their valence electrons in the same principal energy level because the period number equals the principal quantum number n for the valence shell.
Recognize that elements in the same group (vertical column) have similar valence electron configurations but not necessarily in the same principal energy level; their valence electrons can be in different shells.
Note that elements with the same number of neutrons or similar atomic numbers do not guarantee valence electrons in the same principal energy level, as these properties do not directly determine electron shell placement.
Conclude that the correct group of elements with valence electrons in the same principal energy level is those in the same period.
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