Sodium (Na)

Practice

Practice sodium

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

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

   Light of wavelength $458\ \mathrm{nm}$ shines on a clean sodium surface. The work function of sodium is $\phi = 2.28\ \mathrm{eV}$ ($1\ \mathrm{eV} = 1.602 \times 10^{-19}\ \mathrm{J}$). 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 sodium atom ($\ce{Na}$)?

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

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3. Question 3Estimate the effective nuclear chargeWarm-up

   Use the simple shielding model $Z_{\text{eff}} = Z - S$, where $S$ is the number of core (inner-shell, $n < 3$) electrons and electrons in the same shell do not shield each other. What is $Z_{\text{eff}}$ for a valence electron of sodium ($\ce{Na}$)?

   Your answer

   Whole number.

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