Question

When the first periodic table of the elements was published, the elements were arranged by atomic mass. Although several elements seemed out of order, later discoveries showed the order to be correct. Which event most likely helped the development of the periodic table?

Answer 1

Answer;

New information changed the understanding of the atom’s structure.

Explanation;

• Mendeleev is know as the Father of the Modern Periodic Table.  His table allowed scientists to predict the existence of elements that hadn't been discovered.
• Mendeleev saw that when the elements were arranged in order of increasing atomic mass, those that had similar properties occurred in a repeating pattern. He predicted that elements yet to be found would fill the gaps in his table.