TRENDS

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TRENDS
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Trend in Atomic Radius

• Atomic Radius
• The size of an atom is determined by the
  boundaries of the valence e-. The largest atoms
  are those found in the lower-left corner since
  these atoms have the largest n (most shells).

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Trend in Ionization Energy
Ionization energy The energy required to remove
the valence electron from an atomic species. The
ionization energy is largest toward the
upper-right corner of PT since these atoms hold
on to their valence e- the tightest.
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Trend in Electronegativity
Electronegativity Indicates the relative
ability of an atom to attract electrons in a
chemical bond. Arbitrary units called Paulings
(after Linus Pauling) are used to express
electronegativity. Electronegativity increases
from left to right across a period and from top
to bottom down a group.
http//www.webelements.com/webelements/properties/
text/image-intensity/electroneg-pauling.html
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Summary of Trend

• Periodic Table and Periodic Trends
• Electron Configuration

Ionization Energy Largest toward UR of
PT Electronegativity Largest toward UR of PT
Atomic Radius Ionic Radius Largest toward
bottom-left corner of PT