Multiple Choice
Sulfur is classified as which type of element, and how many valence electrons does a sulfur atom possess?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many total valence electrons are present in a neutral manganese (Mn) atom?
A
8
B
5
C
7
D
2
Verified step by step guidance1
Identify the electron configuration of a neutral manganese (Mn) atom. Manganese has an atomic number of 25, so it has 25 electrons.
Write the electron configuration for Mn: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5$.
Determine which electrons are considered valence electrons. For transition metals like Mn, valence electrons include those in the outermost s and d orbitals.
Count the electrons in the 4s and 3d orbitals: $4s^2$ and $3d^5$, which gives a total of $2 + 5 = 7$ valence electrons.
Conclude that a neutral manganese atom has 7 valence electrons.
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