What Are the Periodic Trends for Atomic Radii, Ionization Energy Assignment

Assignment Task

Trends in the Periodic Table

We know that Mendeleev designed the periodic table in a way so that elements with similar properties were grouped together. The periodic recurrence of properties when the elements are arranged in order of increasing atomic mass is called:

The Periodic Law

Similar but gradually changing properties in the periodic table are known as trends .

This assignment will have you graphing and observing these trends and then analyzing your results.

The main trends that can be observed in the periodic Table are:

1. Atomic radius
2. Ionic radius
3. Ionization energy
4. electron affinity
5. electronegativity

The two trends in which we will focus are ATOMIC RADIUS and IONIZATION ENERGY .

Please answer the following questions on a separate piece of paper or on the backside of your graph paper.

ATOMIC RADIUS

• Define atomic
• Plot a line graph with atomic number as the x-axis and atomic radius as the y-axis. Be sure to properly label the graph and create a title.
• Circle all the peaks and identify these elements directly on the graph .
• Circle all the troughs and identify these elements directly on the
• What do these elements have in common?
  • Identify the trends in atomic radius as you move across the periodic table from left to right.
  • Identify the trends in atomic radius as you move down the periodic
• Provide reasoning for these trends using your understanding of periodic

IONIZATION ENERGY

• Define ionization
• write the ionization energy EQUATIONS for each of the
• write the equations for electron affinity for the
• Plot a line graph with atomic number as the x-axis and ionization energy as the y-axis. Be sure to properly label the graph and create a title.
• Circle all the peaks and identify these elements directly on the graph .
• Circle all the troughs and identify these elements directly on the
• What do these elements have in common?
  • Identify the trends in ionization energy as you move across the periodic table from left to right.
  • Identify the trends in ionization energy as you move down the periodi
• Provide reasoning for these trends using your understanding of periodic trends

CORRELATIONS

• How the atomic radii and ionization energies are related (i.e when atomic radius increases what happens to the ionization energy?) Describe the correlation that you observe.
• Use your graph to predict the atomic radius of Explain
• Use your graph to predict the ionization energy of Explain
• When a chlorine atom forms an ion its radius increases, but when a sodium atom forms an ion its radius decreases. Explain this apparent contradiction .

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