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32. In general, ionization energy increases from left to right across a given

period. Aluminum, however, has lower ionization energy than magnesium

Explain.

User Tjrburgess
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Aluminum's outer electron in 3p-orbital is slightly further from the nucleus and protected by 3s-orbital. This causes it to need less energy. Magnesium's outer electron is closer and not protected by an outer orbital.
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User Arshad
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