Even as the earlier scientist never had access to sophisticated laboratories as we now have these days. They were able to discover all the elements in the periodic table and gave us different values of each element's properties without a modern laboratory as we have presently.

This seems mystical to me!

I wonder if there should not have been an objection to some of the values considering the fact that we now have better technologies.

Any fundamental explanation by revered modern scientist will be highly appreciated!

Thanks!