Periodic Trends to know for unit 10-11 exam

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6 Terms

1
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Electronegativity

is a measure of the tendency of an atom to attract a bonding pair of electrons

2
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Electronegativity decreases….

Down a group!!

  • more core electrons means less attraction from the outer electrons

3
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Electronegativity increases…

Across a period!!

  • the attractive power of the nucleus increases

4
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Atomic Radius

is the distance from the nucleus to the outermost electron shell of an atom.

5
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Atomic Radius Increases…

Down a group!

  • valence electrons get further from the nucleus = bigger atom

6
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Atomic Radius Decreases…

Across a period!!

  • valence electrons are pulled closer and more strongly to the nucleus = smaller atom