Multiple Choice
Which element is the most abundant in the universe by mass?
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4. Atoms and Elements
Periodic Table: Classifications
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How did Dmitri Mendeleev primarily arrange the periodic table in his original 1869 version?
A
By increasing atomic number, placing elements with similar chemical properties in the same columns
B
By arranging elements in order of decreasing electronegativity
C
By increasing atomic mass, placing elements with similar chemical properties in the same columns
D
By grouping elements strictly by physical state at room temperature (solid, liquid, gas)
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