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10-19-11 - Chemistry 1A F11 10.19.11 Dr Shaka Practice...

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129 Chemistry 1A F11 10.19.11 Dr. Shaka Course Code 40000 Practice Problem 10 Ans (cont). (d) Thorium is in the actinide series, and is mildly radioactive.
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130 Chemistry 1A F11 10.19.11 Dr. Shaka Course Code 40000 A Geometric Picture For each value of n we can establish a way to keep track of the orbitals, by drawing a square of n × n comprised of boxes. Each box in the figure can hold two electrons. Therefore, for each principal quantum number n , there are 2 n 2 electrons allowed.
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131 Chemistry 1A F11 10.19.11 Dr. Shaka Course Code 40000 Energy Ordering By l Although in hydrogen the energy only depends on n , E = E ( n ) in other atoms it depends on both n and l , E = E ( n,l) . The two phenomena that influence the ordering are penetration and shielding . s electrons have non-zero probability of being found very near the nucleus. This is true even if they are 2 s or 3 s electrons. On the other hand, p electrons have zero probability of being found at the nucleus.
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132 Chemistry 1A F11 10.19.11 Dr. Shaka Course Code 40000
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