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CATALYST (3 MIN)
What are the following elements and what family are they in?
1. 1s22s1
2. 1s22s22p5
3. 1s22s22p63s2
4. 1s22s22p63s23p6
YOU DO: COMPLETE QUIZ 2 ALIGNMENT GUIDE (5 MIN)
Step 1: Mark the incorrect answers on your answer sheet.
Step 2: Fill in the number correct on your alignment guide in the “Score” column.
Step 3: Calculate the percent correct for each set of questions. Write this in the “Mastery” column.
Step 4: Answer the Questions below the table.
# correct out of 5
Mastery
5 100
4 80
3 60
2 40
1 20
# correct out of 4
Mastery
4 100
3 75
2 50
1 25
# correct out of 3
Mastery
3 100
2 67
1 33
YOU DO: COMPLETE QUIZ 1 ALIGNMENT GUIDE (5 MIN)
# correct out of 2
Mastery
2 100
1 50
ANNOUNCEMENTSHomework: Quiz two study guide, due day of quiz
Office hours Wednesday and Friday
Test corrections any time during office hours
Unit 2 exam and quiz schedule:
Quiz Two Friday 10/12 (ODD)Monday 10/15 (EVEN)
Exam 2 Thursday 10/18 (ODD)Friday 10/19 (EVEN)
OBJECTIVE
SWBAT determine the periodic trends per group and period of main elements
SWBAT relate the reactivity of elements to their electron structure
IONIZATION ENERGY
• Ionization energy is the energy needed to steal an electron away from an atom.
• When an electron is removed the atom becomes a positive ion.
• LOW Ionization energy = VERY Reactive!!
TRENDS IN IONIZATION ENERGY
• Ionization energy increases from left to right across a period.
• # of protons increases, positive nucleus pulls the electrons closer, harder to pull one electron off.
• Ionization energy decreases down a group
• electrons are farther from the nucleus, easier to pull one electron off
EXAMPLE: IONIZATION ENERGY
QUESTION
Which element has the lowest ionization energy?
• Lithium• Sodium• Cesium• Rubidium
GUIDED EXAMPLE: IONIZATION ENERGY
EXAMPLE 1
Which element has the lowest ionization energy?
• Gallium
• Germanium
• Arsenic
• Bromine
EXAMPLE 2
Which element has the highest ionization energy?
• Magnesium
• Barium
• Radon
• Strontium
#6.3 Aim:What
trends do we see on the
Periodic Table?
Agenda
QOD (10)
Activity: graphing atomic
radii (15)
Share: trends (5)
Lesson: periodic
trends(15)
HW #3
ELECTRONEGATIVITY• Electronegativity is the interest of atoms
in attracting or keeping electrons.
• An atom that is electronegative is an electron thief.
PERIODIC TRENDS IN ELECTRONEGATIVITY
Electronegativity increases from left to right across a period.
• # of protons increases, nucleus pulls the electrons closer, easier to attract an electron
Electronegativity decreases down a group.
• electrons are farther from the nucleus, harder to attract an electron
EXAMPLE: ELECTRONEGATIVITY
QUESTION
• Which element has the highest electronegativity?
• Silicon• Aluminum• Sulfur• Phosphorous
GUIDED EXAMPLE: ELECTRONEGATIVITY
EXAMPLE 1
Which element has the lowest electronegativity?
• Gallium
• Germanium
• Arsenic
• Bromine
EXAMPLE 2
Which element has the highest electronegativity?
• Magnesium
• Barium
• Radon
• Strontium
ATOMIC RADIUS• Atomic radius is how wide an atom is
• The radius of an atom is directly related to its size.
• Bigger radius=Bigger atom
EXAMPLE: ATOMIC RADIUS
QUESTION
• Which element has the largest atomic radius?
• Boron• Gallium• Titanium• Indium
METHOD
1) Question Asking? Atomic Radius
2) Horizontal or VerticalTrend? Vertical
3) “Biggest” or “Smallest”? Biggest
4) Direction of Arrow? Small to Big
5) Answer ?
GUIDED EXAMPLES: ATOMIC RADIUS
EXAMPLE 1
Which element has the smallest atomic radius?
• Krypton (Kr)
• Germanium (Ge)
• Calcium (Ca)
• Arsenic (As)
EXAMPLE 2
Which element has the largest atomic radius?
• Silicon (Si)
• Lead (Pb)
• Carbon (C)
• Germanium (Ge)
PERIODIC TRENDS SUMMARY TABLE
Trend Going from left to right this ….
Going from top to bottom this…
Atomic Number Increases Increases
Atomic Radius Decreases Increases
Ionization Energy Increases Decreases
Electronegativity Increases Decreases
WE DO: PERIODIC TRENDS TABLE (15 MIN)
• Write the definitions for each trend
• Use the chart to write the # value for each trend on the table
• When finished, look at the numbers and write whether the trend is increasing or decreasing
THEY DO: PERIODIC TRENDS WAR GAME (20 MIN)
• Pick a partner and grab a bag of cards
• Place a card down, the one with the greater value for the trend wins both cards
• Repeat until one player has all the cards
• If you put down the same card, play ‘war’
YOU DO: BOOK PRACTICE PROBLEMS (20 MIN)
Complete the following book problems to turn in at the end of class:
p.182 #18, 22, 24, 25
p. 186 #38, 41, 45, 48
HOMEWORK1. Which has the largest atomic radius: nitrogen (N),
antimony (Sb), or arsenic (As)? The smallest?
2. For each of the following properties, indicate whether fluorine or bromine has a larger value.
• Electronegativity• Atomic radius• Ionization energy• Atomic number
3. Which element in each pair has the larger ionization energy?
• Li, N• Kr, Ne• Cs, Li