Selenium (Se)

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Practice selenium

Questions from the course about selenium. If you’re signed in, your answers count toward your progress.

1. Question 1Ground-state electron configurationExam level

   Which is the ground-state electron configuration of a neutral selenium atom ($\ce{Se}$)?

   A$[\mathrm{Ar}]\,4s^{2}\,4p^{4}$B$[\mathrm{Ar}]\,4s^{2}\,3d^{10}\,4p^{5}$C$[\mathrm{Ar}]\,4s^{2}\,3d^{10}\,4p^{4}$D$[\mathrm{Ar}]\,4s^{2}\,3d^{10}\,4p^{3}$

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2. Question 2Count unpaired electronsWarm-up

   How many unpaired electrons are there in a ground-state gaseous selenium atom ($\ce{Se}$)?

   Your answer

   Whole number.

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3. Question 3Estimate the effective nuclear chargeWarm-up

   Use the simple shielding model $Z_{\text{eff}} = Z - S$, where $S$ is the number of core (inner-shell, $n < 4$) electrons and electrons in the same shell do not shield each other. What is $Z_{\text{eff}}$ for a valence electron of selenium ($\ce{Se}$)?

   Your answer

   Whole number.

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