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The following error occurs in the solutions manual for both the<br>
13th and 14th editions.<br>
<br>
For problem 7.46(a) Ru^3+ the electron configuration is given as<br>
[Kr]3d<sup class="moz-txt-sup"><span
style="display:inline-block;width:0;height:0;overflow:hidden">^</span>5</sup>.
It should be [Kr]4d<sup class="moz-txt-sup"><span
style="display:inline-block;width:0;height:0;overflow:hidden">^</span>5</sup>.
It is in the 5th row (period).<br>
<br>
Ru is actually an exception you didn't have to know. It's electron<br>
configuration is<br>
<br>
[Kr]5s<sup>1</sup>4d<sup class="moz-txt-sup"><span
style="display:inline-block;width:0;height:0;overflow:hidden">^</span>7</sup>
(you would have expected [Kr]5s<sup>2</sup>4d<sup
class="moz-txt-sup"><span
style="display:inline-block;width:0;height:0;overflow:hidden">^</span>6</sup>).<br>
<br>
The electrons come out of the valence shell first. This means for
the <br>
transition metals the electrons come out of the s subshell first,
the <br>
ns (in this case the 5s) and then the (n-1)d (in this case the 4d).
<br>
<br>
By the way, even if you had written the wrong electron config.<br>
for Ru ([Kr]5s<sup>2</sup>4d<sup class="moz-txt-sup"><span
style="display:inline-block;width:0;height:0;overflow:hidden">^</span>6</sup>)
and then removed 3 electrons you would still<br>
get the correct electron config. for the Ru^3+ ion.<br>
<br>
Dr. Zellmer
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