Silicon (Si)

Practice

Practice silicon

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

1. Question 1Ground-state electron configurationWarm-up

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

   A$1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{1}$B$1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{4}$C$1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{2}$D$1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{3}$

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2. Question 2Count unpaired electronsWarm-up

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

   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, $n < 3$) electrons and electrons in the same shell do not shield each other. What is $Z_{\text{eff}}$ for a valence electron of silicon ($\ce{Si}$)?

   Your answer

   Whole number.

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