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Slide 1 of 31 Periodic Trends 6.3 Section 6.3-2 Periodic Trends II.

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Presentation on theme: "Slide 1 of 31 Periodic Trends 6.3 Section 6.3-2 Periodic Trends II."— Presentation transcript:

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2 Slide 1 of 31 Periodic Trends 6.3 Section Periodic Trends II

3 Slide 2 of 31 © Copyright Pearson Prentice Hall Periodic Trends > Ions Some compounds are composed of particles called ions. An ion is an atom or group of atoms that has a positive or negative charge. A cation is an ion with a positive charge. An anion is an ion with a negative charge

4 © Copyright Pearson Prentice Hall Slide 3 of 31 Periodic Trends > Trends in Ionization Energy What are the trends among the elements for first ionization energy, ionic size, and electronegativity? 6.3-2

5 © Copyright Pearson Prentice Hall Slide 4 of 31 Periodic Trends > Trends in Ionization Energy ionization energy The energy required to remove an electron from an atom is called ionization energy. The energy required to remove the first electron from an atom is called the first ionization energy. The energy required to remove an electron from an ion with a 1+ charge is called the second ionization energy

6 © Copyright Pearson Prentice Hall Slide 5 of 31 Periodic Trends > Trends in Ionization Energy Group and Periodic Trends in Ionization Energy First ionization energy tends to decrease from top to bottom within a group and increase from left to right across a period

7 © Copyright Pearson Prentice Hall Slide 6 of 31 Periodic Trends > Trends in Ionization Energy 6.3-2

8 © Copyright Pearson Prentice Hall Slide 7 of 31 Periodic Trends > Trends in Ionization Energy Largest Smallest

9 © Copyright Pearson Prentice Hall Slide 8 of 31 Periodic Trends > Trends in Ionization Energy smallest largest

10 Slide 9 of 31 © Copyright Pearson Prentice Hall Periodic Trends > Trends in Electronegativity Electronegativity is the ability of an atom of an element to attract electrons when the atom is in a compound. In general, electronegativity values decrease from top to bottom within a group. For representative elements, the values tend to increase from left to right across a period

11 Slide 10 of 31 © Copyright Pearson Prentice Hall Periodic Trends > Trends in Electronegativity Representative Elements in Groups 1A through 7A Largest Smallest

12 © Copyright Pearson Prentice Hall Periodic Trends > Slide 11 of 31 Summary of Trends What is the underlying cause of periodic trends? 6.3-2

13 Slide 12 of 31 © Copyright Pearson Prentice Hall Periodic Trends > Summary of Trends The trends that exist among these properties can be explained by variations in atomic structure

14 © Copyright Pearson Prentice Hall Slide 13 of 31 Periodic Trends > Summary of Trends Atomic Size Increases Decreases Size of cationsShieldingNuclear ChargeElectronegativityIonization energySize of anionsIonic size Constant 6.3-2

15 © Copyright Pearson Prentice Hall Slide 14 of Which of the following sequences is correct for atomic size? a.Mg > Al > S b.Li > Na > K c.F > N > B d.F > Cl > Br 6.3 Section Quiz

16 © Copyright Pearson Prentice Hall Slide 15 of Section Quiz 2. Metals tend to a.gain electrons to form cations. b.gain electrons to form anions. c.lose electrons to form anions. d.lose electrons to form cations.

17 © Copyright Pearson Prentice Hall Slide 16 of Section Quiz 3. Which of the following is the most electronegative? a.Cl b.Se c.Na d.I

18 The End ! !


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