Use the periodic table below to answer the following questions. 
-Which elements commonly form cations?
Definitions:
Annual Precipitation
The total amount of precipitation, including rain, snow, sleet, or hail, that falls in a given area over a year.
Cities
Large, densely populated urban areas that serve as the major centers of culture, politics, economy, and social services.
Millimetres
A metric unit of length equal to one thousandth of a meter.
IQR
The Interquartile Range, which represents the spread of a dataset, is calculated by subtracting the 25th percentile from the 75th percentile.
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