Chromium (Cr)

Practice

Practice chromium

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

1. Question 1Ground-state electron configurationChallenging

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

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

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2. Question 2Electron configuration of an ionChallenging

   Which is the ground-state electron configuration of $\ce{Cr^3+}$?

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

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3. Question 3Fill an atomic orbital diagramChallenging

   Complete the orbital diagram for the valence electrons of a ground-state chromium atom ($\ce{Cr}$). Only the 4s and 3d subshells are shown; the [Ar] core is full and not drawn. Obey the Pauli principle and Hund's rule.

   Tap places

   ↑spin up↓spin down

   Tap a box: empty → ↑ → ↑↓ → empty. Long-press, right-click or press M for a menu; D adds a ↓, U adds a ↑, Delete empties; arrow keys move between boxes.

   ▲Energy

   $3d$

   $4s$

   0 electrons placed

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