Multiple Choice
Which element has the following orbital diagram?1s: ↑↓2s: ↑↓2p: ↑↓ ↑↓ ↑↓3s: ↑↓3p: ↑↓ ↑↓ ↑↓4s: ↑↓3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
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10. Periodic Properties of the Elements
The Electron Configuration
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many unpaired electrons are present in the ground state of a krypton (Kr) atom?
A
2
B
6
C
0
D
4
Verified step by step guidance1
Recall that the number of unpaired electrons in an atom depends on its electron configuration in the ground state.
Write the electron configuration of krypton (Kr), which has an atomic number of 36. The configuration is: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6$.
Note that all the subshells in krypton's electron configuration are completely filled: the $s$ subshells have 2 electrons, the $p$ subshells have 6 electrons, and the $d$ subshell has 10 electrons.
Since all subshells are fully filled, all electrons are paired, meaning there are no unpaired electrons in the ground state of krypton.
Therefore, the number of unpaired electrons in a ground state krypton atom is zero.
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