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