Boron (B)

Practice

Practice boron

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

1. Question 1Ground-state electron configurationWarm-up

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

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

   CheckDifferent question

2. Question 2Count unpaired electronsWarm-up

   How many unpaired electrons are there in a ground-state gaseous boron atom ($\ce{B}$)?

   Your answer

   Whole number.

   CheckDifferent question

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, $n < 2$) electrons and electrons in the same shell do not shield each other. What is $Z_{\text{eff}}$ for a valence electron of boron ($\ce{B}$)?

   Your answer

   Whole number.

   CheckDifferent question