Question

What is the correct chronological order of scientists contributing to the modern periodic table? A. Lavoisier, Newlands, Moseley, Dobereiner, and Mendeleev B. Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley C. Moseley, Mendeleev, Newlands, Dobereiner, and Lavoisier

Answer 1

Dobereiner,Newland,mendeelev,moseley

Answer 2

The correct answer to this question is option B. Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley.

Explanation:

• In 1789, Lavoisier gave the periodic table distribution by placing a number of elements into two groups; metals and non-metals.

• In 1817, Dobereiner tried to organize elements in a periodic table by putting them in groups of three with similar physical and chemical properties. These groups were called triads.

• In 1864, Newlands classed a total of 62 elements into 8 groups according to their individual physical properties. These groups were known as the Law of Octaves.

• In 1869, Mendeleev organized the periodic table on the foundation of atomic mass. Here, the elements were assembled in the increasing order of their atomic masses.

• In 1913, Moseley organized the periodic table on the basis of the increasing number of protons in the elements.