Multiple Choice
Which of the following valence electron configurations corresponds to an atom in an excited state?
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10. Periodic Properties of the Elements
The Electron Configuration: Quantum Numbers
Multiple Choice
Which noble gas is used as the core in the noble gas electron configuration for plutonium (Pu)?
A
Kr (krypton)
B
Rn (radon)
C
Xe (xenon)
D
He (helium)
Verified step by step guidance1
Understand that the noble gas electron configuration shorthand uses the electron configuration of the nearest noble gas preceding the element to simplify the notation.
Identify the atomic number of plutonium (Pu), which is 94, to determine which noble gas comes before it in the periodic table.
Recall the atomic numbers of the noble gases: He (2), Ne (10), Ar (18), Kr (36), Xe (54), and Rn (86).
Compare these atomic numbers to 94 and find the noble gas with the largest atomic number less than 94, which is radon (Rn) with atomic number 86.
Conclude that radon (Rn) is used as the core in the noble gas electron configuration for plutonium (Pu).
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