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Periodic trends

Periodic trends. L. Minilab. Pg 164 Use graph paper on center counter No lab write up required Answer analysis questions on graph paper Show me completed product. Atomic Radius. Remember: e - cloud is a probability Has no defined edge Outer limit = 90% of finding an e - inside

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Periodic trends

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  1. Periodic trends L

  2. Minilab • Pg 164 • Use graph paper on center counter • No lab write up required • Answer analysis questions on graph paper • Show me completed product

  3. 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?

  4. Generally Decreases Generally Increases

  5. 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

  6. 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

  7. MINI DEMO • Moo-licious

  8. 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)

  9. 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

  10. 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. F

  11. Oh Francium, I feel we can share anything Fr Cs I very much agree. By the way, Cesium, thanks for letting me borrow your shoes. I have shoes? Where? Which orbital??

  12. My crutch • Youtube take it home

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