The differences between old and modern periodic table are as follows:
Mendeleev's Table (Old Periodic Table)
Modern Periodic Table (Long Form Table)
Arrangement of elements are done on atomics weights (mass)
Arrangement of elements are done on atomic number
Contains 66 elements
Contains 118 known elements
Noble Gases not mentioned in old periodic table because it was not discovered
Noble gases are included in Group 18
Transistion elements were placed with other elements
Transition elements are placed in seperate block
<p>The differences between old and modern periodic table are as follows:</p><table style="border-collapse: collapse; width: 100.037%;" border="1"><colgroup><col style="width: 49.9451%;"><col style="width: 49.9451%;"></colgroup><tbody><tr><td><strong>Mendeleev's Table (Old Periodic Table)</strong></td><td><strong>Modern Periodic Table (Long Form Table)</strong></td></tr><tr><td>Arrangement of elements are done on atomics weights (mass)</td><td>Arrangement of elements are done on atomic number</td></tr><tr><td>Contains 66 elements</td><td>Contains 118 known elements</td></tr><tr><td>Noble Gases not mentioned in old periodic table because it was not discovered</td><td>Noble gases are included in Group 18</td></tr><tr><td>Transistion elements were placed with other elements</td><td>Transition elements are placed in seperate block</td></tr></tbody></table>
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