Answer: In Mendeleeve periodic table the elements are arranged in increasing atomic mass, whereas in the modern periodic table the elements are arranged in increasing atomic number. The further differences are as follows:
Step-by-step explanation:
In Mendeleev periodic table there are 9 verticle columns, whereas in modern periodic table there are 18 verticle columns.
A group of nobel gases was not discovered in the Mendeleev periodic table, whereas the a nobel gas was placed separately in the modern periodic table.