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Wednesday , January 12, 2011

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.

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Wednesday , January 12, 2011

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  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 # 1 - 29

  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? (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. (see page 188, table 7.1; draw each diagram !)

  8. 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 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

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