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The order in the first attempt in the Periodic Table was in the increasing order of atomic weights of atoms. This gave 2 different places for isotopes of the same element with same properties and the same place for isobars with different properties. This was so because chemical properties of an element depends on its number of electrons which is basically given by the atomic number and not atomic weight. Again the lanthanides and actinides had different places inspite of having similar properties due to same atomic number.

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Q: How is the order different to the first attempt in the periodic table?
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Related questions

How are the elements in the first periodic table arranged?

In the first Periodic Table by Mendeleev, he arranged the elements in the increasing order of their atomic masses and repeating properties.


How did Amitri Mendeleev develop the First periodic table?

he developed the first periodic table in the increasing order of atomic masses of elements.but after the discovery of isotopesthis periodic table was not consider to be effective.


Which comes first electronegativity electron configuration periodic trends ionic radius atomic radius ionization energy or periodic table?

On the periodic table there is no such order of first and second as asked in the question.


Main idea of mendeleevs first periodic table?

In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.


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Because It has 1 proton. The elements on the periodic table are order by the number of protons.


Why is hydrogen the first element?

As the periodic table is arranged in order of increasing atomic number hydrogen is the first element in the periodic table as it has only one electron.


What are the different features of periodic table?

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How is the periodic table is organized into columns called?

The elements arranged according to their atomic number in the table are called periodic table.


Did Dmitri Mendeleev develop the first periodic table?

Mendeleev arranged the elements in the increasing order of their atomic masses and repeating periodic properties.


He prepared the first periodic table of elements arranged in the order of atomic masses?

Dmitri Ivanovich Mendeleev


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