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Which of the following is the correct electron configuration for indium (In)?
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10. Periodic Properties of the Elements
The Electron Configuration
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How many p orbitals are occupied by electrons in a krypton (Kr) atom in its ground state?
A
6
B
12
C
9
D
3
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Recall that each p subshell contains 3 p orbitals, and each orbital can hold up to 2 electrons.
Determine the electron configuration of krypton (Kr), which has 36 electrons, to identify how many electrons occupy the p orbitals.
Write the electron configuration: \$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6$.
Count the p orbitals that contain electrons: the 2p, 3p, and 4p subshells are fully occupied, each with 3 orbitals filled.
Since each of these three p subshells has 3 orbitals occupied, the total number of occupied p orbitals is \(3 \times 3 = 9\).
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