Periodic Trends
Finalizing our Understanding of the Organization of the Periodic table
Directions: Define the following terms.
Atomic Radius -
Ionization Energy -
Electronegativity -
Directions: Using Graphs to Visualize Trends on the Periodic Table
On the next page you will find 6 different tables. On a separate piece of paper, create a graph for each table, graphing
atomic number versus the trend of interest. Be sure to title your graphs, and label the x-axis and y-axis. Once finished
check graphs with Ms. Herndon before moving on to the questions below
Electronegativity Across a Period (Row)
Element
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Atomic Number Electronegativity
3
1.0
4
1.5
5
2.0
6
2.5
7
3.0
8
3.5
9
4.0
Electronegativity Down a Group (Column)
Element
Beryllium
Magnesium
Calcium
Strontium
Barium
Radium
Atomic
Number
4
12
20
38
56
88
Electronegativity
1.5
1.2
1.0
1.0
0.9
0.9
Atomic Radius Across a Period (Row)
Element
Atomic Number
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
3
4
5
6
7
8
9
10
Atomic Radius
(10-10 m)
2.1
1.4
1.2
0.91
0.75
0.65
0.57
0.51
Atomic Radius Down a Group (Column)
Element
Beryllium
Magnesium
Calcium
Strontium
Barium
Atomic
Number
4
12
20
38
56
Atomic Radius
(10-10 m)
1.4
1.7
2.2
2.5
2.8
Periodic Trends
Finalizing our Understanding of the Organization of the Periodic table
Ionization Energy Across a Period (Row)
Element
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Atomic Number Ionization Energy
(J/mol)
3
519
4
900
5
799
6
1088
7
1401
8
1036
9
1682
10
2076
Ionization Energy Down a Group (Column)
Element
Beryllium
Magnesium
Calcium
Strontium
Barium
Radium
Atomic
Number
4
12
20
38
56
88
Ionization
Energy (J/mol)
900
736
590
548
502
510
Directions: Using your graphs you just drew for the above data tables, answer the following questions.
1)
Does electronegativity increase or decrease left to right across a period?
2)
Does electronegativity increase or decrease down a group?
3)
Does ionization energy increase or decrease left to right across a period?
4)
Does ionization energy increase or decrease down a group?
5)
Does atomic radius increase of decrease left to right across a period?
6)
Does atomic radius increase or decrease down a group?