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Well, Back when Medeleev made this table, many of the elements were not even discovered yet. He plotted only the elements that he knew on his table. He organized them by increasing atomic weight. He didn't know all the elements so he would put question marks and empty spaces in the spots he thought elements would be and left to be found by other scientist. He happened to be true about the missing elements and that scientist did end up finding these "missing links" of the Periodic Table and led to the new or modern periodic table. The modern periodic table doesnt have any missing elements and they changed Medeleev's way of organizing the table by increasing atomic weight to increasing atomic number. So the newer form of the periodic table was complete and made it easier to find what elements react better with other elements. This making the modern table became the more efficent table of our time.

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15y ago
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12y ago

Old periodic table has 65 elements and new table 118 elements

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11y ago

New Periodic Law: Based on atomic numbers

Old Periodic Law: Based on atomic weights

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11y ago

basically, the new periodic table have more elements than the old one, but there are just two elements that are swapped in the old periodic table.

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Q: What is the difference between the new and old periodic table?
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Related questions

When new elements are placed into the periodic table what happens?

If new elements are placed, then they would be appended in the periodic table. It won't disturb existing periodic table.

Will the periodic table always look the same?

No, because as the days and years go past, more scientists will find out more information on the periodic table. When they find out information on the periodic table, sometimes new elements are found, adding new elements on the periodic table causes it to change.

Who introduced new periodic table?


What is a group of elements in the periodic table?

A group is a column in the periodic table of elements.

What are the most metals on the periodic table?

There are 91 metals in the periodic table today, but new ones are added as time passes.

When did mendeleev create a new row in his periodic table?

Mendeleev supposed that a new row is necessary in the periodic table after the discovery of lanthanoides.

What are the elements whose discovery added an entirely new row to Mendeleev's periodic table?

The Noble Gases, It added a new "Group" to the periodic Table.

When did mendeleev create a new row on the periodic table?

Mendeleev created a new row on the periodic table every time chemical properties were repeated.

Development of periodic table?

The modern periodic table of the elements was published by Dimitri Mendeleev in 1869. Several new elements have been discovered and added to the table since then.

Will the periodic table be change anymore?

Yes, we will forever be adding new elements to the periodic table as we figure out new ways to make them; however, most of what you see now will stay the same.

When is it necessary to start a new period in the periodic table?

Periods in the periodic table represent the number of electron shells necessary to fit all of the electrons. Once you fill the valence shell of an atom, the next electron must go in a new electron shell. This would constitute a new period on the periodic table.

How many elements were there on the periodic table in 1960?

There were 102 known elements on the periodic table in 1960.