1. Wednesday, January 12, 2011
DO NOW: Copy the dot structures for hydrogen, carbon, and oxygen (page 188, table 7.1) HOMEWORK: Chapter 7 Reading and embedded questions#1-29(Questions due tomorrow) TLW: Express ions in abbreviated format; use multiple forms to identify specific ions.

2. Wednesday, January 12, 2011 Copy Date, DoNow(and answer), HW
Review Lesson Steps
Discuss Do Now
Notes continue: Chapter 7 Reading and embedded questions#1-29
(Questions due tomorrow)
MAIN IDEAS: IONIC BONDING; ELECTRON DOT STRUCTURES; IONS REPRESENTED WITH NUMBERS AND LETTERS

3. NOTES: CH 7 QUESTIONS LABEL PAPER: NAME, DATE, HOUR
CHAPTER 7: READ AND ANSWER EMBEDDED QUESTIONS #

4. Chapter 7 questions (page 193, Chemistry Textbook) Jan. 11, 2011
Numbers 1 and 2 are answered on page R87, at the back of the textbook.
How can you determine the number of valence electrons in an atom of a representative element?
(see page 187) “To find the number of valence electrons in an atom of a representative element, simply look at its group number.”
Atoms of which element tend to gain electrons? Atoms of which elements tend to lose electrons?
(page 188) “Atoms of the metallic elements tend to lose their valence electrons, leaving a complete octet in the next- lowest energy level. Atoms of some nonmetallic elements tend to gain electrons with another nonmetallic element to achieve a complete octet.”

5. How do cations form?
(page 188) “An atom's loss of valence electrons produces a cation, or a positively charged ion.”
How do anions form?
(page 191) “The gain of negatively charged electrons by a neutral atom produces an anion.”

6. How many valence electrons are in each atom
How many valence electrons are in each atom? (see electron dot structures, page 188)
Potassium, K: 1
Carbon, C: 4
Magnesium, Mg: 2
Oxygen, O: 6

7. Draw the electron dot structure for each element in Question 7
Draw the electron dot structure for each element in Question 7. (see page 188, table 7.1; draw each diagram !)

8. How many electrons will each element gain or lose in forming an ion
How many electrons will each element gain or lose in forming an ion? (notes in class… use the group number and/ or dot structures to understand this concept)
Calcium (Ca)
fluorine (F) Fluorine will gain ONE ELECTRON. When neutral, it has 7. In order to gain a full octet, it will gain ONE ELECTRON.
aluminum (Al)
oxygen (O)

9. Write the electron configuration of Cd 2+ s
Write the name and symbol of the ion formed when (notes in class; selected answer given here)
a potassium atom loses one electron
a zinc atom loses two electrons: Zn2+
a fluorine atom gains one electron
Write the electron configuration of Cd 2+ s