Mendeleev left gaps in his original periodic table due to which of the following reasons?

Braemen Brown Asked: Mendeleev left gaps in his original periodic table due to which of the following reasons?

a)He had to leave gaps in order to make the periodic table square.

b)He was psychic and knew that elements were going to be discovered, so he may as well leave gaps for them.

c)He had to leave gaps to put elements with similar electron configurations into the same column.

d)The gaps were for elements in which the number of neutrons were known to be inaccurate.

e)He had to leave gaps in order to put elements with similar properties in the same column. He predicted that elements would be discovered to fill the blanks.

Answers:

David Answered:
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kentucky Answered:
Yes, e) is the answer.He originally started lining the elements up by atomic mass, since at that time they did not know about electrons, protons and neutrons, and even the idea of the existence of atoms was controversial.Also remember that the Noble Gases had not been discovered, so they weren't there.He noticed that there were gases "Periodically" throughout the list he made, so he changed the list into a table with similar materials being placed below and above each other.In some cases, this arrangement didn't quite work and he had to slide the row over by one spot to keep properties the same.This created a hole that he said had to be filled.



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