Question

Give two points of differences between modern periodic table and Mendeleev's periodic table.​

Answer 1

Hey mate here is your answer

The main difference between Mendeleev and Modern Periodic Table is that-

Mendeleev’s periodic table had gaps for the missing elements at that time.

Modern periodic table has no concept as such.

Mendeleev’s periodic table has elements with dissimilar properties in the same group sometimes.

Modern periodic table’s elements have similar properties repeated at regular intervals.

Mendeleev’s periodic table orders the elements based on their atomic weight.

Modern periodic table orders the elements based on their atomic number.

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Answer 2

Answer:

• Mendeleev's periodic table

1. elements are arranged in increasing order of their atomic masses.
2. It is not divided into any blocks.
3. There are 8 groups.
4. Isotopes could not be placed properly.

• Modern periodic table

1. Elements are arranged in increasing order of their atomic numbers.
2. It is divided into four blocks, namely s-block,p-block,d-block and f-block.
3. There are 18 groups.
4. Isotopes occupy the same position as the element.

Hope you understood mate!!!