Wednesday, November 15, 2006
Wednesday 11/15 Recap
AP: we explained the Periodic Trend in atomic size/radius across a Period (from left to right) and down a group in terms of Zeff, OPEL's, and electron-electron repusion. We didn't get into the minutiae of HOW scientists measure atomic size (there are various ways, each of which give consistent but different values).
We then explained atom to ion size differences for cations and anions. We explained size differences among isoelectronic particles.
We began to explain the trend in ionization energy across a Period; we will continue to do so tomorrow while emphasizing the minor exception to the trend that always occur in Groups 13 and 16.
Test-taking tips for Regents and Honors Students:
For anything that you had to memorize for tomorrow's test, write out what you are afraid that you will forget repeatedly in order to put the information into your short-term memory. Then, AS SOON AS THE TEST BEGINS, write that information down on the test paper! If you know a good example of something that is related to what is on the test, WRITE THAT EXAMPLE down immediately on the test paper. This way, you can always remember and refer to your example at any time during the test. The one minute that you take at the beginning of the test to write these things down can save a lot of time and prevent errors on your test.
Also, label and annotate the key words in a given question; for example, if you see the word orbital in a question, DRAW ONE! Show that an orbital can hold a MAXIMUM of two opposite spin electrons.
Use these tips on any test that you take and you should do better.
Regents: We explained in terms of Zeff, OPEL's (just stick to those two reasons for all trends except for relating the size of an atom to its anion- that requires you to consider electron-electron repulsion within the valence shell of electrons) the Periodic Table trends in Ionization energy across a Period (form left to right) i.e. ionization energy increases across a period and ionization energy decreases down a group. We explained successive ionization energies and related that to the element's number of valence electrons. We discussed electronegativity and the Periodic trend in electronegativity across a Period and down a group.
The test tomorrow will cover all Periodic Table notes through today's discussion up to successive ionization energies (but not electronegativity). REVIEW and understand the notes, the homework and worksheets; then you will do well.
Honors: we discussed Mendeleev's formulation of the Periodic Table and the anomalies that he encountered because he did not know about electron configuration. At the end of class in D, I started to talk again about the different differences in energy between respective sublevels of different elements. I will draw that out better and more quantitatively on Friday.
Study (that means draw and write and then actually REFER TO YOUR DRAWING in your answers!) hard as you go over your notes and hw.
We then explained atom to ion size differences for cations and anions. We explained size differences among isoelectronic particles.
We began to explain the trend in ionization energy across a Period; we will continue to do so tomorrow while emphasizing the minor exception to the trend that always occur in Groups 13 and 16.
Test-taking tips for Regents and Honors Students:
For anything that you had to memorize for tomorrow's test, write out what you are afraid that you will forget repeatedly in order to put the information into your short-term memory. Then, AS SOON AS THE TEST BEGINS, write that information down on the test paper! If you know a good example of something that is related to what is on the test, WRITE THAT EXAMPLE down immediately on the test paper. This way, you can always remember and refer to your example at any time during the test. The one minute that you take at the beginning of the test to write these things down can save a lot of time and prevent errors on your test.
Also, label and annotate the key words in a given question; for example, if you see the word orbital in a question, DRAW ONE! Show that an orbital can hold a MAXIMUM of two opposite spin electrons.
Use these tips on any test that you take and you should do better.
Regents: We explained in terms of Zeff, OPEL's (just stick to those two reasons for all trends except for relating the size of an atom to its anion- that requires you to consider electron-electron repulsion within the valence shell of electrons) the Periodic Table trends in Ionization energy across a Period (form left to right) i.e. ionization energy increases across a period and ionization energy decreases down a group. We explained successive ionization energies and related that to the element's number of valence electrons. We discussed electronegativity and the Periodic trend in electronegativity across a Period and down a group.
The test tomorrow will cover all Periodic Table notes through today's discussion up to successive ionization energies (but not electronegativity). REVIEW and understand the notes, the homework and worksheets; then you will do well.
Honors: we discussed Mendeleev's formulation of the Periodic Table and the anomalies that he encountered because he did not know about electron configuration. At the end of class in D, I started to talk again about the different differences in energy between respective sublevels of different elements. I will draw that out better and more quantitatively on Friday.
Study (that means draw and write and then actually REFER TO YOUR DRAWING in your answers!) hard as you go over your notes and hw.
# posted by C @ 10:23 AM 
