Questions: This Scientist proposed a model of the Periodic Table where Elements are arranged by Atomic Mass. Moseley Mendeleev Newlands Dobereiner

This Scientist proposed a model of the Periodic Table where Elements are arranged by Atomic Mass. Moseley Mendeleev Newlands Dobereiner
Transcript text: This Scientist proposed a model of the Periodic Table where Elements are arranged by Atomic Mass. Moseley Mendeleev Newlands Dobereiner
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Solution

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Solution Steps

Step 1: Understand the Question

The question asks which scientist proposed a model of the Periodic Table where elements are arranged by atomic mass. We are given four options: Moseley, Mendeleev, Newlands, and Dobereiner.

Step 2: Recall Historical Contributions
  • Moseley: Known for arranging elements by atomic number, not atomic mass.
  • Mendeleev: Proposed the first widely recognized periodic table, arranging elements by increasing atomic mass and predicting the existence of undiscovered elements.
  • Newlands: Known for the Law of Octaves, which also involved arranging elements by atomic mass.
  • Dobereiner: Known for his triads, grouping elements in threes based on similar properties, but not a full periodic table.
Step 3: Identify the Correct Scientist

Based on historical contributions, Dmitri Mendeleev is the scientist who proposed a model of the Periodic Table where elements are arranged by atomic mass.

Final Answer

\(\boxed{\text{Mendeleev}}\)

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