Ch-6 sec-3. Atomic Size Atomic Size is measured as half the distance between two nuclei Size...
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Transcript of Ch-6 sec-3. Atomic Size Atomic Size is measured as half the distance between two nuclei Size...
Periodic TrendsCh-6 sec-3
Atomic SizeAtomic Size is measured as half the distance
between two nucleiSize generally decreases with atomic number
within a periodSize generally increases with atomic atomic
number within a group.
Atomic Size
Atomic Size
Atomic size
Ionization EnergyThe energy required to remove an electron
from an atom.1st, 2nd, 3rd…ionization energys1st ionization energy generally decreases
from top to bottom within a group1st ionization energy generally increases from
left to right within a period
Ionization Energy
Ionization Energy
Main Group Ionization Energy
Ionization Energy
Ion sizeCations = positive ions resulting from loss of
an electronAnions = negative ions resulting from gain of
electronsGroup trend: increases down a groupPeriodic trend: varies (general decrease )
Ionic Size
Ionic Size
ElectronegativityThe ability for an atom to attract electrons
when the atom is in a compoundRated on a scale of 0-4Values decrease from top to bottom in a
groupValues increase from left to right within a
period
Trends in Electronegativity
electronegativity
Electron AffinityThe energy change that occurs when an
electron is acquired by a neutral atom Most atoms release energyPeriodic trend: generally increase from left to
rightGroup trend: somewhat irregular, slightly
decreases from top to bottom
Electron Affinity
Electron Affinity
Electron Affinity
Other TrendsNuclear charge: increase of
protonsIncreases across and downHelps to explain other trends
ShieldingIncreases downConstant across
summations
Summations
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