21 Which of the trends below describe atomic radius ionization energy and electron affinity A B C Increases Increases Increases Increases Increases Increases Ionization energy Electron Affinity Electronegativity ID: 433575
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Slide1
Journal #21
Which of the trends below describe atomic radius, ionization energy, and electron affinity?
A
B
C
Increases
Increases
Increases
Increases
Increases
IncreasesSlide2
Ionization energy, Electron Affinity, Electronegativity
Atomic radiusSlide3
Today we will draw Lewis Dot structuresSlide4
Valence Electrons
Valence electrons are an atom’s outermost electrons. The number of valence electrons an atom has corresponds to the group (vertical column) the atom lies in on the Periodic Table of the Elements. The valence electrons are largely responsible for the atom’s chemical behaviorSlide5
Write the number of valence electrons for the following elements:
SodiumFluorineNeonHydrogenPotassium
LithiumSlide6
Lewis Dot Structures
Lewis Dot structures show valence electrons which are represented as dots placed around the element symbolUnpaired valence electrons represent electrons available for bonding or for linking with other elementsElements with the same number of valence electrons have the same Lewis dot structures.Ex: O, Be, Mg,Slide7
It is important to know how to draw Lewis dot structures because:
Lewis dot structures help scientists to see which valence electrons are responsible for the chemical behavior of an atomThey show the electrons that are available for bonding by quickly seeing the unpaired valence electronsLewis dot structures are used by scientists to make new compounds (plastics, metals, packaging materials, etc.Slide8
Which of the following elements has the same Lewis dot structure as silicon?
A. Germanium (Ge)B. Aluminum (Al)C. Arsenic (As)D. Gallium (Ga)Slide9
Drawing Lewis Dot Structures
Find the number of valence electrons.Write down the symbol of the element.Draw the Lewis dot diagram.Place all the electrons clockwise around the element symbolNo side receives 2 dots until each side receives one. Exception: Helium
Write down the number of unpaired valence electrons or electrons available for bonding.Slide10
Element
Number of Valence ElectronsLewis Dot Structure
# of Unpaired valence electronsLithium
Potassium
BoronCarbonSlide11
Which pairs of elements have the same
Lewis dot structure? Why is this so?Where did I find the symbol for the element?How did I know where to get the number of valence electrons?What do the dots represent in the Lewis Dot structure?Slide12
Element
Number of Valence Electrons
Lewis Dot Structure# of Unpaired valence electrons
Arsenic
IodineBeryllium
Flourine