Which of the following lists the scientists in the correct chronological order based on their contributions to the development of the modern periodic table?

• A. Newlands, Dobereiner, Moseley, Mendeleev
• B. Moseley, Mendeleev, Dobereiner, Newlands
• C. Mendeleev, Dobereiner, Moseley, Newlands
• D. Dobereiner, Newlands, Mendeleev, Moseley

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the historical context of the development of the periodic table by identifying the key contributions of each scientist mentioned.
2. Step 2: Recognize that Johann Dobereiner, in the early 19th century (around 1829), proposed the concept of triads, grouping elements with similar properties in sets of three.
3. Step 3: Note that John Newlands, in 1864, introduced the Law of Octaves, arranging elements in order of increasing atomic mass and noticing repeating properties every eighth element.
4. Step 4: Acknowledge that Dmitri Mendeleev, in 1869, created the first widely recognized periodic table, organizing elements by increasing atomic mass and predicting properties of undiscovered elements.
5. Step 5: Understand that Henry Moseley, in 1913, used X-ray spectra to determine atomic numbers, which led to the modern periodic law where elements are arranged by atomic number rather than atomic mass.