Multiple Choice
Which of the following represents the noble gas electron configuration for beryllium (Be)?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following represents the noble gas electron configuration of titanium (Ti)?
A
[Ar] 3d4
B
[Ne] 3s2 3p6 4s2 3d2
C
[Ar] 4s2 3d2
D
[Kr] 5s2 4d2
Verified step by step guidance1
Identify the atomic number of titanium (Ti), which is 22. This tells us the total number of electrons in a neutral Ti atom.
Recall that the noble gas electron configuration uses the electron configuration of the previous noble gas as a shorthand to represent the core electrons.
Determine the noble gas that comes before titanium in the periodic table. This noble gas will represent the core electrons in the shorthand notation.
Write out the electron configuration of titanium starting from the noble gas core, then add the remaining electrons in the appropriate orbitals following the Aufbau principle, Hund's rule, and Pauli exclusion principle.
Compare the options given to see which one correctly represents the noble gas core plus the valence electrons for titanium, which should be [Ar] 4s2 3d2.
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