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His table was sorted by Atomic Mass, not atomic number. (the way today's Periodic Table is sorted) Mendeleev was almost right, but they did not know about protons at the time. (atomic number is the number of protons in an element) There would have been absolutely no way of him figuring out they were related to atomic number if he didn't even know about atomic number

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Q: Why was mendeleev's periodic table valid at all?
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Related questions

What did Mendeleevs periodic table look like?

It looks the same as it did when Mendeleev created it. There are no changes made to the table throughout the years because Mendeleev had predicted the correct placement for all of our current known elements.


How could you use Mendeleevs periodic table to identitify new elements?

He left gaps for the new elements. The properties could be estimated from the space left by him.


What does mendeleevs first periodic table look like?

The first periodic table was a handwritten table by Mendeleev. It had groups horizontally across the top and periods down the left hand side. The elements were all put into certain groups with only their chemicals symbols and atomic numbers depicted.


Are all elements in the periodic table renewable?

Not all the elements in the periodic table are renewable.


Where are all the elements on earth listed?

The periodic table.


What is a chart that lists all the known elements?

It is called the Periodic Table of Elements.


What elements on the periodic table are corrosive?

The most corrosive elements on the Periodic Table are all of the halogens.


Why is hydrogen in the perodic table?

Hydrogen is in the periodic table because it is an element, and all elements are in the periodic table.


Is there any acid or alkalis on the periodic table?

Acids are not on the periodic table. Acids are compounds, the periodic table is only for elements.


Why does Thorium belong on the periodic table?

All chemical elements are placed in the periodic table.


What does the modern periodic table contain?

The periodic table contain all the chemical elements.


What does the modern periodic table include?

The periodic table include all the chemical elements.