differentiate between the arrangement of elements in Mendeleev periodic table and Modern Periodic Table for three marks
saharnyazbek:
In the modern periodic table, the elements are arranged in order of increasing atomic number. (In Mendeleev's table, they were arranged in order of increasing atomic weight). ... The gaps in Mendeleev's have been filled by the elements that were discovered.
Hope this helps you !!
BUT SIR WHY THE ELEMENTS INCREASED?
Answers
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Mendeleev Classification was on the basis of increasing atomic mass and physical and chemical properties ..
modern concept of Periodic table states that physical and chemical properties are periodic function of Atomic number not mass
Cause of periodicity -- Repeated valence shell configuration .
Hope it helps u
modern concept of Periodic table states that physical and chemical properties are periodic function of Atomic number not mass
Cause of periodicity -- Repeated valence shell configuration .
Hope it helps u
thank u rohit for ur help.
my pleasure : )
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Answer:
- Mendeleev's periodic table
- elements are arranged in increasing order of their atomic masses.
- It is not divided into any blocks.
- There are 8 groups.
- Isotopes could not be placed properly.
- Modern periodic table
- Elements are arranged in increasing order of their atomic numbers.
- It is divided into four blocks, namely s-block,p-block,d-block and f-block.
- There are 18 groups.
- Isotopes occupy the same position as the element.
Hope you understood mate!!!
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