Previous to the X-ray emission evidence of 1913,the order of the elements in the periodic table was based on which of the following?

Question

Quizplus · Accepted Answer

Before the discovery of X-ray emission evidence in 1913, the order of the elements in the periodic table was based on increasing atomic mass. This was the primary criterion used by Dmitri Mendeleev when he created the first widely recognized periodic table.

Previous to the X-Ray Emission Evidence of 1913,the Order of the Elements