Multiple Choice
Which of the following is the correct number of valence electrons for the molecule NH2OH (hydroxylamine)?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following elements has exactly one unpaired electron in its p orbital?
A
Carbon (C)
B
Phosphorus (P)
C
Fluorine (F)
D
Nitrogen (N)
Verified step by step guidance1
Recall that the number of unpaired electrons in an element depends on its electron configuration, especially in the outermost (valence) shell.
Write the electron configuration for each element, focusing on the p orbitals: Carbon (C), Nitrogen (N), Phosphorus (P), and Fluorine (F).
Determine the distribution of electrons in the p orbitals for each element using Hund's rule, which states that electrons fill degenerate orbitals singly before pairing up.
Count the number of unpaired electrons in the p orbitals for each element based on their electron configurations.
Identify which element has exactly one unpaired electron in its p orbitals by comparing the counts from the previous step.
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