Atomic Radius and Periodic Table Patterns

What is the definition of atomic radius presented in the passage? Is it a simple concept or are there complexities involved? Explain.

How do chemists typically determine the atomic radius of an element? Describe the experimental procedure. What are the key steps?

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NGSS.HS-PS1-1

What is the general trend in atomic radius as you move down a group on the periodic table? Does the size of the atoms increase or decrease?

What is the general trend in atomic radius as you move across a period (from left to right) on the periodic table? Does the size of the atoms increase or decrease?

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NGSS.HS-PS1-1

How do both electron shielding and nuclear charge contribute to the trend in atomic radius across a period?

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NGSS.HS-PS1-1

As you move down a group, what is happening with the number of electron shells? How does this affect atomic radius?

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NGSS.HS-PS1-1

In your own words, summarize the main reasons for the observed trends in atomic radii, both down a group and across a period. Be sure to connect your explanations to the concepts of nuclear charge and electron shielding

Draw a diagram to illustrate the periodic trend of atomic radii going down a group

Draw a diagram to illustrate the concept of electron shielding. Show the nucleus, inner shell electrons, and outer shell electrons to explain how shielding affects the pull of the nucleus on the outer electrons.