Arsenic (As)

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Practice arsenic

Questions from the course about arsenic. 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 arsenic atom ($\ce{As}$)?

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

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2. Question 2Estimate 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 arsenic ($\ce{As}$)?

   Your answer

   Whole number.

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3. Question 3Compare two elements and explainExam level

   Which element has the larger atomic radius, $\ce{Ca}$ or $\ce{As}$, and why?

   AAs: it has more electrons, and more electrons take up more space.BCa: it has more occupied electron shells.CCa: its valence electrons (same shell, n = 4) feel a smaller effective nuclear charge, so they are held less tightly.DAs: its greater effective nuclear charge spreads the electron cloud out.

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