Consider the first ionization energy for nitrogen (N) and oxygen (O).  Of the two, which one has the highest first ionization energy? 1. Nitrogen 2. Oxygen Because 1. It is easier to remove an electron from a px orbital compared to a py 2. It is easier to remove an electron if there are only five valence electrons vs. six.  3. It is easier to remove an electron from a doubly occupied orbital due to electron-electron repulsion.  4. It is easier to remove an electron from a singly occupied orbital because electrons want to be paired.

Chemistry: Matter and Change
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Chapter6: The Periodic Table And Periodic Law
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Consider the first ionization energy for nitrogen (N) and oxygen (O).  Of the two, which one has the highest first ionization energy?

1. Nitrogen

2. Oxygen

Because

1. It is easier to remove an electron from a px orbital compared to a py

2. It is easier to remove an electron if there are only five valence electrons vs. six. 

3. It is easier to remove an electron from a doubly occupied orbital due to electron-electron repulsion. 

4. It is easier to remove an electron from a singly occupied orbital because electrons want to be paired. 

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