PERIODIC TRENDSL
Minilab Pg 164 Use graph paper on center counter No lab write up required
Answer analysis questions on graph paper Show me completed product
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Molar Heat of Fusion
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Molar Heat of Vapor-ization
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HfHv
Atomic Radius Remember: e- cloud is a probability
Has no defined edge Outer limit = 90% of finding an e- inside
Atomic size – how close an atom lies to it’s neighbor For metals = half the distance b/t adjacent nuclei For non-solids = half the distance b/t nuclei of identical
atoms bonded together chemically Decreases as you move across the period
Why? Increases as you move down families
Why?
Generally DecreasesGe
nera
lly In
crea
ses
Your book is lame… Ions
e- are negatively charged Atoms that gain or lose 1+ gain a net
charge Gains and losses are always in the valence
shell Ion = +/- atom or bonded group of atoms
Ionic Radius What would a positive charge do to the atomic
radii?
What would a negative charge do to the atomic radii?
Periods Decrease till you get to group 5
Families Increase as you go down the periodic table
MINI DEMO Moo-licious
Ionization energy Energy needed to remove a curtain # of e- from an
atom’s valence shell 1st ionization energy
Periods Increases
Families Decreases
Why? What has the greatest 1st ionization energy? NOBLE GASES!!!
Octet rule: Atoms will gain/lose e- to become more stable and have a perfect octet (like a noble gas)
Electronegativity Ability of an atom to attract e- in a
chemical bond Noble gases aren’t part of this b/c they
don’t react readily with anything Higher electronegativity pulls more on
the e-
Periods Increases from left to right
Families Decreases going down
F
My name is Fluorine.
Ryan Seacrest is gay.Paula is stupid.
You should never sing again.
I once was in a band.
That will be $15 Million.
Fr Cs
Oh Francium, I feel we can
share anything
I very much agree. By the way, Cesium, thanks for letting me borrow your shoes.
I have shoes? Where? Which
orbital??
My crutch Youtube take it home