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What do the valence shells of all the noble gas elements have in common?
African Americans
A demographic group in the United States with ancestry traced to the black racial groups of Africa.
Middle and Upper Classes
Social groups categorized by higher levels of wealth, income, education, or occupational prestige compared to the working or lower classes.
Gender Role
Societal norms dictating the behaviors, tasks, and responsibilities that are considered appropriate for men and women.
Mortality Rate
A measure of the number of deaths in a particular population, scaled to the size of that population, per unit of time.
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