Multiple Choice
For the element titanium (Ti), which has the electron configuration [Ar] 4s^2 3d^2, how many unpaired electrons are present in a neutral Ti atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons does a neutral atom of aluminum (Al) possess?
A
3
B
2
C
1
D
5
Verified step by step guidance1
Identify the atomic number of aluminum (Al), which is 13. This tells us the total number of electrons in a neutral atom of aluminum.
Determine the electron configuration of aluminum by filling the orbitals in order of increasing energy: 1s, 2s, 2p, 3s, and 3p.
Write the electron configuration for aluminum: $1s^2 2s^2 2p^6 3s^2 3p^1$.
Recognize that valence electrons are the electrons in the outermost shell (highest principal quantum number). For aluminum, this is the third shell (3s and 3p orbitals).
Count the electrons in the 3s and 3p orbitals: $3s^2$ has 2 electrons and $3p^1$ has 1 electron, so aluminum has a total of 3 valence electrons.
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