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Ionization is the process of removing an electron from a neutral atom (or compound). The energy required to remove an electron is the ionization energy. The ionization energy differs for each element on the periodic table. Across a period, ionization energy tends to increase. Down a group, the ionization energy tends to decrease.

Sections:
00:00 - What is ionization energy?
00:29 - Ionization energy trend down a group
01:13 - Ionization energy trend across a period
02:28 - Summary of observed trends
02:30 - Why ionization energy decreases down a group
03:34 - Why ionization energy increases across a period

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