Periodic Trends

7 important questions on Periodic Trends

How does electronegativity change down a group?

Electronegativity decreases down a group (because of increased shielding effect, the shielding effect increases which blocks the proton pull).

What is the trend of ionization energy across a period?

Ionization energy increases across a period (because the increasing number of protons in the nucleus creates a stronger pull on the valence electrons).

Describe the trend of ionization energy down a group.

Ionization decreases down a group (because the outermost electrons are farther from the nucleus and are shielded by more inner electron shells).
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How does electron shielding change across a period?

Electron shielding stays the same across a period (because the atoms all have the same number of energy levels).

What happens to electron shielding down a group?

Electron shielding increases down a group (because the atoms gain an energy level as you move down).

How does the atomic radius change across a period?

The atomic radius decreases across a period (because the proton pull increases, which pulls on the electrons and decreases the radius).

What happens to the atomic radius down a group?

The atomic radius increases down a group (because the number of energy levels and shielding effect increases which reduces the proton pull effect).

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