Multiple Choice
Which pair of elements have the same valence electronic configuration of np^5?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following elements has a complete valence electron shell?
A
Fluorine (F)
B
Sodium (Na)
C
Neon (Ne)
D
Oxygen (O)
Verified step by step guidance1
Recall that a complete valence electron shell means the outermost shell of an atom is fully occupied by electrons, typically following the octet rule (8 electrons) for most main-group elements, or 2 electrons for the first shell.
Identify the electron configuration of each element to determine the number of valence electrons: Fluorine (F) has 7 valence electrons, Sodium (Na) has 1 valence electron, Neon (Ne) has 8 valence electrons, and Oxygen (O) has 6 valence electrons.
Understand that Neon (Ne) is a noble gas with a full outer shell of 8 electrons, making it chemically stable and inert under normal conditions.
Compare the valence electron counts: Fluorine, Sodium, and Oxygen do not have full valence shells, while Neon does.
Conclude that Neon (Ne) has a complete valence electron shell, which is why it is the correct answer.
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