Answer the following questions about first ionization energies.

(a) Generally, ionization energies increase on proceeding across a period, but this is not true for magnesium (738 kJ/mol) and aluminum (578 kJ/mol). Explain this observation.

(b) Explain why the ionization energy of phosphorus (1012 kJ/mol) is greater than that of sulfur (1000 kJ/mol) when the general trend in ionization energies in a period would predict the opposite.

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Christian GarciaLv10

7 Dec 2020

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Why is the ionization energy of phosphorus is greater than of sulfur when the general trend in ionization energies in a period would predict the opposite?

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a. Using the element phosphorus as an example, write the equation for a process in which the energy change will correspond to the ionization energy and to the electron affinity.

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