What is the trend in atomic size as you move down a group in the periodic table?

What is the trend in atomic size as you move down a group in the periodic table?

Step 1: Understand what a group is in the periodic table. A group is a column of elements that have similar properties.
Step 2: Know that each element in a group has the same number of valence electrons, which are the electrons in the outermost shell.
Step 3: Realize that as you move down a group, each successive element has an additional electron shell compared to the one above it.
Step 4: Recognize that more electron shells mean that the outermost electrons are farther from the nucleus.
Step 5: Conclude that because the outermost electrons are farther away, the overall size of the atom increases as you go down a group.

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