Krypton (Kr)

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Practice krypton

Questions from the course about krypton. 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 krypton atom ($\ce{Kr}$)?

   A$[\mathrm{Ar}]\,4s^{2}\,3d^{10}\,4p^{6}$B$[\mathrm{Kr}]\,5s^{1}$C$[\mathrm{Ar}]\,4s^{2}\,4p^{6}$D$[\mathrm{Ar}]\,4s^{2}\,3d^{10}\,4p^{5}$

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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 krypton ($\ce{Kr}$)?

   Your answer

   Whole number.

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3. Question 3Compare two elements and explainExam level

   Which element has the higher first ionization energy, $\ce{Kr}$ or $\ce{Xe}$, and why?

   AXe: its larger nuclear charge holds its electrons more tightly.BXe: first ionization energy increases down a group.CKr: it has a larger nuclear charge than Xe.DKr: its valence electron is in a lower shell (n = 4), closer to the nucleus, so it is held more tightly.

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