Copper (Cu)

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Practice copper

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

1. Question 1Photoelectric effect: kinetic energy of ejected electronsExam level

   Light of wavelength $186\ \mathrm{nm}$ shines on a clean copper surface. The work function of copper is $\phi = 4.65\ \mathrm{eV}$ ($1\ \mathrm{eV} = 1.602 \times 10^{-19}\ \mathrm{J}$). What is the maximum kinetic energy of the ejected electrons, in eV?

   Your answer (in the unit shown)

   $\mathrm{eV}$

   Scientific notation: type 4.86e-7 or 4.86 x 10^-7.

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2. Question 2Ground-state electron configurationChallenging

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

   A$[\mathrm{Ar}]\,4s^{1}\,3d^{10}$B$[\mathrm{Ar}]\,4s^{2}\,3d^{8}$C$[\mathrm{Ar}]\,4s^{2}\,3d^{9}$D$[\mathrm{Ar}]\,4s^{2}\,3d^{10}$

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3. Question 3Electron configuration of an ionChallenging

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

   A$[\mathrm{Ar}]\,3d^{9}$B$[\mathrm{Ar}]\,4s^{2}\,3d^{7}$C$[\mathrm{Ar}]\,4s^{1}\,3d^{10}$D$[\mathrm{Ar}]\,4s^{1}\,3d^{8}$

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