Catalyst Use your notes to answer the following questions 1. What group is Br in? 2. What family is Br in? 3. What family is Mg in? 4. Is Cl a metal or a nonmetal? 5. What period is Ne in?
Catalyst
Jan 02, 2016
Catalyst. Use your notes to answer the following questions 1. What group is Br in? 2. What family is Br in? 3. What family is Mg in? 4. Is Cl a metal or a nonmetal? 5. What period is Ne in?. BY THE END OF TODAY. You should be able to answer this question: - PowerPoint PPT Presentation
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Catalyst
Use your notes to answer the following questions
1. What group is Br in?
2. What family is Br in?
3. What family is Mg in?
4. Is Cl a metal or a nonmetal?
5. What period is Ne in?
BY THE END OF TODAY
You should be able to answer this question:
Beryllium (Be) has a ______ atomic size and a ______ electronegativity compared to Nitrogen (N).
A. larger; larger B. larger; smaller
C. smaller; smaller D. smaller; larger
Today’s Agenda
5 min
• Catalyst
20 min
• Periodic Trends: Atomic Radius
20 min
• Periodic Trends: Electronegativity
5 min
• Exit Slip
What is a trend?
Is the average senior shorter or taller than the average freshman?
So are older students generally taller or shorter than younger students?
We would say that there is a trend: as grade level increases, height increases.
What are some other trends?
What is Atomic Size?
Atomic size is…How big an atom isAlso known as atomic radius
H Li Na
K Rb Cs Fr
WHAT DID YOU NOTICE?
What is happening in this graph?
The atomic size is increasing as you move down a group
0
20
40
60
80
100
120
140
160
0 2 4 6 8 10
Element
Ato
mic
Ra
diu
s (
pic
om
ete
r)
Li Be B C N O F Ne
WHAT DID YOU NOTICE?
What is happening in this graph?
The atomic size is decreasing as you move across a period
PUT IT TOGETHER!
Atomic size (radius) increases as you move down a group, and decreases as you move left to right across a period
Why?
Why do elements get smaller as we go to the right? More protons, pulls in those electrons closer.
Why do elements get bigger as you go down the group?
More electrons block the positive charge of the nucleus on the outer electrons. This is called electron shielding.
Practice Problems: Level 1
Write and answer these in your notes
1. Which of the following has the largest atomic radius? C, F, Be, Ne
2. Which of the following has the smallest atomic radius? Ge, Pb, Sn, C
Practice Problems Method
Method:
Question Asking? ___________________
Horizontal or Vertical Trend? ___________________
“Biggest” or “Smallest”? __________________
Direction of Arrow? ______________________
Answer ________________________
Atomic Radius
Horizontal
Which of the following has the largest atomic radius? C, F, Be, Ne
Biggest
Left
Be
Practice Problems Level 1
Answer these in your notes
1. Which of the following has the largest atomic radius? C, F, Be, Ne
2. Which of the following has the smallest atomic radius? Ge, Pb, Sn, C
Practice Problems Method
Method:
Question Asking? ___________________
Horizontal or Vertical Trend? ___________________
“Biggest” or “Smallest”? __________________
Direction of Arrow? ______________________
Answer ________________________
Atomic Radius
Vertical
Which of the following has the smallest atomic radius? Ge, Pb, Sn, C
Smallest
Up
C
Practice Problems Level 1
Answer these in your notes
1. Which of the following has the largest atomic radius? C, F, Be, Ne
2. Which of the following has the smallest atomic radius? Ge, Pb, Sn, C
Practice Problems Level 2
Write and answer in your notes
Rank the following elements in order of increasing atomic size based on location on the periodic table (smallest to biggest)
Fr, W, P, Ga
F, As, Tl, S
P, Ga, W, Fr
F, S, As, Tl
Today’s Agenda
5 min
• Catalyst
20 min
• Periodic Trends: Atomic Radius
20 min
• Periodic Trends: Electronegativity
5 min
• Exit Slip
What is electronegativity?
Electronegativity is…The ability of an atom to
attract electrons to itself in a chemical bond
How much an atom wants electrons
0
0.5
1
1.5
2
2.5
0 1 2 3 4 5 6 7 8
Element
Ele
ctro
neg
ativ
ity
H Na
Li RbK Cs Fr
WHAT DO YOU NOTICE?
What is happening in this graph?
The electronegativity is decreasing as you move down a group
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0 2 4 6 8
Element
Ele
ctro
neg
ativ
ity
Li Be CB ON F
WHAT DO YOU NOTICE?
What is happening in this graph?
The electronegativity is increasing as you move left to right across a period
PUT IT TOGETHER!
Electronegativity decreases as you move down a group, and increases as you move left to right across a period
Electronegativity Trends
Practice Problems: Level 1
Write and answer these in your notes
1. Which of the following has the largest electronegativity? C, F, Be, Ne
2. Which of the following has the smallest electronegativity? Ge, Pb, Sn, C
Practice Problems Method
Method:
Question Asking? ___________________
Horizontal or Vertical Trend? ___________________
“Biggest” or “Smallest”? __________________
Direction of Arrow? ______________________
Answer ________________________
Electronegativity
Horizontal
Which of the following has the largest electronegativity? C, F, Be, Ne
Biggest
Right
Ne
Practice Problems: Level 1
Write and answer these in your notes
1. Which of the following has the largest electronegativity? C, F, Be, Ne
2. Which of the following has the smallest electronegativity? Ge, Pb, Sn, C
Practice Problems Method
Method:
Question Asking? ___________________
Horizontal or Vertical Trend? ___________________
“Biggest” or “Smallest”? __________________
Direction of Arrow? ______________________
Answer ________________________
Electronegativity
Vertical
Which of the following has the smallest electronegativity? Ge, Pb, Sn, C
Smallest
Down
Pb
Practice Problems Level 1
Answer these in your notes
1. Which of the following has the largest atomic radius? C, F, Be, Ne
2. Which of the following has the smallest atomic radius? Ge, Pb, Sn, C
Practice Problems Level 2
Write and answer in your notes.
Rank the following elements in order of increasing electronegativity based on location on the periodic table (smallest to biggest)
Mg, Sr, Be, Ra
Cl, Si, Al, S, P
Ra, Sr, Mg, Be
Al, Si, P, S, Cl
How is atomic size related to electronegativity?
Atomic size is indirectly related to electronegativity. (They are opposites.)
ELECTRONEGATIVITY
ATOMIC SIZE
As electronegativity increases, atomic size decreases!
Why is this relationship true?
Atoms with HIGH ELECTRONEGATIVITIES hold their electrons very close!
So, the atomic size decreases
High or low electronegativity?
Large or small atomic size?
Practice Problem Level 3
Chlorine (Cl) has a ______ atomic size and a ______ electronegativity compared to Oxygen (O).
A. larger; larger B. larger; smaller
C. smaller; smaller D. smaller; larger
Today’s Agenda
5 min
• Catalyst
20 min
• Periodic Trends: Atomic Radius
20 min
• Periodic Trends: Electronegativity
5 min
• Exit Slip
Exit Slip
1. What element has the largest atomic radius?a. Flourineb. Hydrogenc. Radond. Caesium
2. What element has the largest electronegativity?
a. Flourineb. Hydrogenc. Radond. Caesium
Exit Slip
3. True or false: Electronegativity is an atom’s ability to repel electrons.
4. Flourine (F) has a ______ atomic size compared to Oxygen (O).
a. Largerb. Smallerc. Equal
5. Chlorine (Cl) has a _______ electronegativity compared to Aluminum (Al).
a. Largerb. Smallerc. Equal
Independent PracticeClasswork: Answer these 5 questions independently in your notes
(10min) You do not have to write the question.
1. True or false: Electronegativity is an atoms ability to repel electrons. (If false, why is this false?)
2. Order the following elements in order of decreasing electronegativity: Y, Ti, Sg, Ta
3. Order the following elements in order of increasing atomic size: Sb, I, Ag, Ru
4. Rank the following elements in order of decreasing atomic size: Rb, K, Sr, Ca
5. As electronegativity increases, what happens to atomic size? Explain why using words and a picture.
Related Documents
