What is the ground-state valence-shell electron configuration of the group of elements indicated by the shaded portion of the periodic table? 
Definitions:
Median
The middle value in a set of ordered data, or the average of the two middle values when the set has an even number of observations.
Absolute Frequency
The count of occurrences or instances of a particular event or property in a dataset.
Ratio
A quantitative relationship between two numbers showing how many times the first number contains the second.
Variable
A symbol or placeholder that represents an unknown or changeable value in mathematics and programming.
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