The trend in metallic character and ionization energy as a function of position in the periodic table is that the metallic character and ionization energy increases as you go down a group.
What is the trend of ionization energy?
- Since the ionization energy decreases going down a group (or increases going up a group), the increased ability for metals lower in a group to lose electrons makes them more reactive.
- Ionization energy is not the same for the atomic size, as you go down a column of the periodic table, the atomic radii increase.
- Ionization energy is because the valence electron shell is getting larger and there is a larger principal quantum number, so the valence shell lies physically farther away from the nucleus.
- Similarly, it is also different for the ionization energy trend, as you go down the periodic table, it becomes easier to remove an electron from an atom (i.e., IE decreases) because the valence electron is farther away from the nucleus.
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