Question

Differentiate between the arrangement of elements in Mendeleev’s periodic table and Modern periodic table.

Answer 1

Answer:

Mendeleev’s Periodic Table

♦) The elements were arranged according to increased atomic masses.

♦) Position of isotopes was not justified.

♦) Position of hydrogen was not justified because it resembles both with Alkali metals and Halogens.

Modern Periodic Table

♦) The elements were arranged according to increased atomic numbers.

♦) There was no problem in the placing of isotopes.

♦) Hydrogen has been given a unique position due to its resemblance with Alkali metals and Halogens.

Answer 2

Answer:

that is the difference the between modern period table and Mendeleev's periodic table