Kind of confused here. in the early 1900s, henry gwyn-jeffreys moseley added to the development of the modern periodic table. which answer best explains how moseley started his investigations? 1. by reviewing the work of those who contributed to the previous versions of the table 2. by making an entirely new organizational scheme for the previous versions of the table 3. by analyzing the work of a select group of contributors to the previous versions of the table 4. by rejecting the work of all those who had previously developed the earlier versions of the table

The correct answer is 1. Moseley started his investigations by reviewing the work of those who contributed to the previous versions of the table.

Explanation:

Henry Gwyn Jeffreys Moseley was a British physicist. His most important scientific contribution was the proof of the correctness of the concept of atomic numbers in chemistry.

In 1913, using X-ray spectroscopy, he found a systematic relationship between the wavelength and the atomic number. Previously, it was assumed that the atomic number was an arbitrary number based on the order of the atomic masses, but had to be changed to bring an element into the right place in the periodic table. Moseley's discovery showed that atomic numbers had an experimentally measurable basis. In addition, he showed that there were gaps in numbers 43, 61 and 75 (known today as the radioactive elements technetium and promethium, as well as the stable but rare rhenium). His work was further proof of the then controversial atomic theory.

the answer for sodium is 0.186

the answer for rubidium is 0.251