Magnesium (Mg)

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Practice magnesium

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

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

   Light of wavelength $275\ \mathrm{nm}$ shines on a clean magnesium surface. The work function of magnesium is $\phi = 3.66\ \mathrm{eV}$ ($1\ \mathrm{eV} = 1.602 \times 10^{-19}\ \mathrm{J}$). 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 configurationWarm-up

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

   A$[\mathrm{Ne}]\,3s^{2}$B$[\mathrm{Ne}]\,3s^{2}\,3p^{1}$C$[\mathrm{Ar}]\,3s^{2}$D$[\mathrm{Ne}]\,3s^{1}$

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3. Question 3Electron configuration of an ionWarm-up

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

   A$1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{2}$B$1s^{2}\,2s^{2}\,2p^{4}\,3s^{2}$C$1s^{2}\,2s^{2}\,2p^{6}$D$1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}$

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