Iron (Fe)

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Practice iron

Questions from the course about iron. 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 iron atom ($\ce{Fe}$)?

   A$[\mathrm{Ar}]\,4s^{2}\,4p^{6}$B$[\mathrm{Ar}]\,4s^{2}\,3d^{7}$C$[\mathrm{Ar}]\,4s^{2}\,3d^{6}$D$[\mathrm{Ar}]\,3d^{8}$

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2. Question 2Electron configuration of an ionExam level

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

   A$[\mathrm{Ar}]\,4s^{2}\,3d^{9}$B$[\mathrm{Ar}]\,4s^{2}\,3d^{3}$C$[\mathrm{Ar}]\,4s^{2}\,3d^{6}$D$[\mathrm{Ar}]\,3d^{5}$

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3. Question 3What holds a solid together?Exam level

   What particles make up solid iron ($\ce{Fe}$), and what holds them together?

   AAtoms, each covalently bonded to its neighbours in one continuous networkBMetal cations in a sea of delocalized valence electrons (metallic bonding)CPositive and negative ions, held together by ionic (electrostatic) attractionsDSeparate molecules, held together by intermolecular forces

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