Oxygen (O)

Practice

Practice oxygen

Questions from the course about oxygen. 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 oxygen atom ($\ce{O}$)?

   A$1s^{2}\,2s^{2}\,2p^{6}$B$1s^{2}\,2s^{2}\,2p^{5}$C$1s^{2}\,2s^{2}\,2p^{4}$D$1s^{2}\,2s^{2}\,2p^{3}$

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2. Question 2Electron configuration of an ionWarm-up

   Which is the ground-state electron configuration of $\ce{O^2-}$?

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

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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, $n < 2$) electrons and electrons in the same shell do not shield each other. What is $Z_{\text{eff}}$ for a valence electron of oxygen ($\ce{O}$)?

   Your answer

   Whole number.

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