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The chart below shows part of the radioactive series beginning with the isotope . The isotope marked with an X is
Enlightenment Thinkers
Intellectuals of the Enlightenment period who advocated for reason, science, and secularism as the paths to knowledge, freedom, and progress.
Individual
A single human being distinct from a group, society, or community.
Ideologies
A framework of thoughts and principles, specifically one that establishes the foundation for policies and theories in politics or economics.
Ruling Class
The social class that decides upon and sets the major policies, owning the majority of wealth, and holds the primary power in a society.
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