Slide 2 Slide 1 of 31 Periodic Trends 6.3 Section 6.3-2 Periodic
Trends II Slide 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. 6.3-2 Slide 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 Slide 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. 6.3-2 Slide 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. 6.3-2
Slide 7 Copyright Pearson Prentice Hall Slide 6 of 31 Periodic
Trends > Trends in Ionization Energy 6.3-2 Slide 8 Copyright
Pearson Prentice Hall Slide 7 of 31 Periodic Trends > Trends in
Ionization Energy 6.3-2 Largest Smallest Slide 9 Copyright Pearson
Prentice Hall Slide 8 of 31 Periodic Trends > Trends in
Ionization Energy 6.3-2 smallest largest Slide 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. 6.3-2 Slide 11 Slide
10 of 31 Copyright Pearson Prentice Hall Periodic Trends >
Trends in Electronegativity Representative Elements in Groups 1A
through 7A 6.3-2 Largest Smallest Slide 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 Slide 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. 6.3-2 Slide 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 Slide 15 Copyright
Pearson Prentice Hall Slide 14 of 31 1. 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
Slide 16 Copyright Pearson Prentice Hall Slide 15 of 31 6.3 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. Slide 17 Copyright Pearson Prentice Hall
Slide 16 of 31 6.3 Section Quiz 3. Which of the following is the
most electronegative? a.Cl b.Se c.Na d.I Slide 18 The End ! !
