Question

difference between the arrangement of elements in mendeleevs periodic table and modern periodic table

Answer 1

Mendeleev's 1869 periodic table: An experiment on a system of elements based on their atomic weights and chemical similarities.In 1869, just five years after John Newlands put forward his Law of Octaves, a Russian chemist called Dmitri Mendeleev published a periodic table. Mendeleev also arranged the elements known at the time in order of relative atomic mass,The modern periodic table. Mendeleev's table needed one important modification before it became the modern periodic table – the use of atomic number to order the elements. All atoms of the same element contain the same number of particles called protons, and this is called the element'satomic 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.

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