Periodic Trends Webquest Part I.

1. Go to www. chemicool. com Click on the following elements and fill in the chart provided.

2. Using the information from the first set of elements, predict what you think the second set might be. Don’t cheat and look!!! Your predictions won’t be graded!

3. Then answer the questions that follow.

Data Table for Periodic Trends Webquest

Element
Atomic Radius
Ionization Energy
Electronegativity
Lithium
145pm
1st 520.2 kJ mol^-1
2nd 7298.1 kJ mol^-1
3rd 1185.0kJ mol^-1
0.98
Beryllium
112pm
1st 899.5kJ mol^-1
2nd 1757.1kJ mol^-1
3rd 14848.7kJ mol^-1
1.57
Boron
85pm
1st800.6kJ mol^-1
2nd2427.1kJ mol^-1
3rd
2.04
Sodium
186pm
1st495.8kJ mol^-1
2nd455562.4kJ mol^-1
3rd6912.2kJ mol^-1
0.93
Magnesium
150pm
1st737.7kJmol^-1
2nd1450.6kJmol^-1
3rd7732.6kJmol^-1
1.31
Aluminum
125pm
1st577.6kJmol^-1
2nd1816.6kJmol^-1
3rd2744.7kJmol^-1
1.61

Your Predictions
Carbon
60 pm
1st 1081.5kJ mol^-1
2nd 2347.6kJ mol^-1
3rd2615.5kJ mol^-1
2.05
Silicon
100 pm
1st 771.4kJmol^-1
2nd 1562kJmol^-1
3rd 3216.4kJmol^-1
1.4
Nitrogen
55 pm
1st 1392.3kJmol^-1
2nd 2846kJmol^-1
3rd 4568kJmol^-1
2.20
Phosphorus
85 pm
1st 1006.7kJmol^-1
2nd 1898.2kJmol^-1
3rd 2906.9kJmol^-1
2.05

Atomic Radius Questions:

1. What appears to be the trend in atomic radius as you move down a column? the atomic radius decreases across a row.
2. What appears to be the trend in atomic radius as you move from left to right in a
row?
The periodic trend.
3. Predict the change in the atomic radius of the next elements in a row (C, Si), then check those properties. Do they match your predictions?
when the atomic number increases the atomic radius will begin to decrease.
4. Check the atomic radius of the next elements in the series (N, P). How do they fit
the predicted pattern?

5. Is the pattern of atomic radius always true or generally true? Explain.

Ionization Energy Questions:
1. What appears to be the trend in ionization energy as you move from left to right in a
row?

2. What appears to be the trend in ionization energy as you move down a column?

3. Predict the change in ionization energy of the next elements in a row (C, Si), then check those properties. Do they match your predictions?

4. Check the ionization energy of the next elements in the series (N, P). How do they fit
the predicted pattern?

5. Is the pattern of ionization energy always true or generally true? Explain

Electronegativity Questions:
1. What appears to be the trend in electronegativity as you move from left to right in a
row?

2. What appears to be the trend in electronegativity as you move down a column?

3. Predict the change in electronegativity of the next elements in a row (C, Si), then
check those properties. Do they match your predictions?

4. Check the electronegativity of the next elements in the series (N, P). How do they fit
the predicted pattern?

5. Is the pattern of electronegativity always true or generally true? Explain.

Summary Questions:
1. State the general trend for each property if you move from left to right on the Periodic
Table. Now, state the general trend from top to bottom.

2. How do atomic radius, ionization energy, and electronegativity change within a
group?

3. How do they change within a period?

4. How are electronegativity and ionization energy related to the atomic radius? Why do you think that?