Thursday, December 11th, 2014 HW: Finish Agenda Questions EXCEPT 12 and 13 Objective: We will be able to explain the trends in atomic size. Standard: Catalyst: A. Some plants were not present at each site. B. Some seeds were not present at each site. C. The seeds may have been removed from the dishes by animals other than ants. D. The plants may have been eaten by animals other than ants. Classroom expectations: Wear Kenwood ID. Cell phones, music players, and headphones are put away. Food is disposed of or put away. Dressed appropriately. Notebook is out and you are ready for today’s class. Answer: C ***Table of Contents 12/11 Periodic Trends Packet 89

Thursday, December 11th, 2014 HW: Finish Agenda Questions EXCEPT 12 and 13 Objective: We will be able to explain the trends in atomic size. Standard: Catalyst: The force between the clamp and tape The force between the clamp and the paper or plastic wrapping The force between the earth and the wrapping The force between the Earth and the tape Classroom expectations: Wear Kenwood ID. Cell phones, music players, and headphones are put away. Food is disposed of or put away. Dressed appropriately. Notebook is out and you are ready for today’s class. Answer: C ***Table of Contents 12/11 Periodic Trends Packet 83

Announcements No tutoring today Tutoring next week: Monday and Tuesday Test NEXT Wednesday Get notebooks organized

Catalyst/Announcements Review Agenda Problems Quiz Begin investigating atomic size

Agenda Problems Mendeleev first organized the periodic table by atomic mass. Groups/Families Periods 4a) very reactive, form 1+ ions, have one valence 4b) very reactive, form 1- ions, 7 valence electrons 4c) forms 2+ ions, have 2 valence electrons, solid at room temp 4d) not reactive, full valence level, gases at room temp 5) Sum to the superscripts equals total electrons 6) Skip 7) skip

Agenda Problems Carbon Magnesium S2 11a) 1s22s2 11b) 1s22s22p63s23p3 11c) 1s22s22p63s23p64s23d104p5 11d) 1s22s22p63s23p64s23d104p65s24d9 11e)

What is a trend? With your elbow partner, discuss what a trend is WITHOUT using the word trend.

What atomic radius mean? Atomic radius is the total distance from the atoms nucleus to the outermost electrons.

Trends Think about it: How would atomic size change down a group on the periodic table? Why? Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Think about it: As you go DOWN a group the number of energy levels INCREASES The valence electrons are farther away from the nucleus

Trends Think about it: How would atomic size change across a period on the periodic table? Why? Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Think about it: As you go ACROSS the period the atomic number (# of protons) INCREASES However, the energy level with the valence electrons stays the same Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.

Trends Atomic size decreases Atomic size increases Chem team!!! I know my explanations are very over-simplified and so if you think of a better way to word these challenge questions PLEASE feel free to edit/change.  I just wanted to include them because students ask these every year in class.