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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.
Element Families (Groups)
1: Alkali Metals2: Alkaline Earth Metals3: Boron Group4: Carbon Group5: Nitrogen Family6: Oxygen Family7: Halogens8: Noble Gases
Element Families (Groups)
Family number = # of valence electrons (v.e.)
1. Helps determine chemical behavior
2. Elements in same family behave similarly, chemically.
Homework Due: Inquiry into the PT
Atomic Radius
Atomic radius decreases as you move left to right across a period.
Atomic radius increases as you move down a family.
Atomic Radius
Atomic RadiusWhy the trend?
As you move left to right across a period...Nuclear Charge:
Valence Shell:
Result:
Atomic RadiusWhy the trend?As you move top to bottom down a family...Nuclear Charge:
Valence Shell:
Result:
Atomic Radius of Ions
Positive Ion RadiusNa+ vs. Na
Negative Ion RadiusCl- vs. Cl
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).
Ionization Energy
Ionization Energy: The energy needed to remove an electron from an atom.
Leads to the formation of an ion (charged particle).
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.
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
Homework
1) Read pg. 307-312 & complete questions on pg. 319-320, #73, 74, 81-84 only in your ISN.
Due Tuesday, 12/8