periodic table trends: atomic radius & ionization energy pg. 307-312 lo: i can describe and...
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Periodic Table Trends: Atomic Radius & Ionization
Energypg. 307-312
LO: I can describe and explain the trend of atomic radius & ionization energy.
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Element Families (Groups)
1: Alkali Metals2: Alkaline Earth Metals3: Boron Group4: Carbon Group5: Nitrogen Family6: Oxygen Family7: Halogens8: Noble Gases
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Element Families (Groups)
Family number = # of valence electrons (v.e.)
1. Helps determine chemical behavior
2. Elements in same family behave similarly, chemically.
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Homework Due: Inquiry into the PT
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Atomic Radius
Atomic radius decreases as you move left to right across a period.
Atomic radius increases as you move down a family.
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Atomic Radius
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Atomic RadiusWhy the trend?
As you move left to right across a period...Nuclear Charge:
Valence Shell:
Result:
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Atomic RadiusWhy the trend?As you move top to bottom down a family...Nuclear Charge:
Valence Shell:
Result:
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Atomic Radius of Ions
Positive Ion RadiusNa+ vs. Na
Negative Ion RadiusCl- vs. Cl
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The Noble Gases
Noble Gases: Group 8Inert (non-reactive), stable elements due to full valence electron shells.
All elements want to “be like” the noble gases (stable).
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Ionization Energy
Ionization Energy: The energy needed to remove an electron from an atom.
Leads to the formation of an ion (charged particle).
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Ionization Energy Trend (I.E.)
I.E. increases as you move left to right across a period.
I.E. decreases as you move down a family.
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Ionization EnergyAs you move left to right across a period Nuclear Charge:
Valence shell:
Result: i.e. increases
As you move top to bottom down a family Nuclear Charge:
Valence shell:
Result: i.e. decreases
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Homework
1) Read pg. 307-312 & complete questions on pg. 319-320, #73, 74, 81-84 only in your ISN.
Due Tuesday, 12/8