Development of the periodic table by mendeleev

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7 Terms

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Atomic Weights
Mass of elements used for early classification.
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Mendeleev
Scientist who created the first periodic table.
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Periodic Table
Arrangement of elements by atomic number and properties.
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Gaps in Table
Spaces left for undiscovered elements by Mendeleev.
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Isotopes
Atoms of the same element with different masses.
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Element Groups
Categories of elements based on similar properties.
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Inappropriate Grouping
Misplacement of elements due to strict atomic weight order.