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merits and de-merits of mendeleevs 2015 - 17
periodic table (3 point.)

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Answer 1

Answer:

Mendelevs scientist of periodic table.

Answer 2

Merits of Mendeleev's perodic table :-

• Through this table , it was very easy to study the physical and chemical properties of various elements.

• Mendeleev adjusted few elements with a slightly greater atomic mass before the elements with slightly lower atomic mass , so that elements with similar properties could be grouped together. For example, aluminum appeared before silicon, cobalt appeared before nickel.

• He predicted some undiscovered elements. And kept space for that also.

• Helium , neon , argon , were placed in new groupe without disturbing the existence order of other elements.

Demerits of Mendeleev's perodic table:-

• No fixed position was given to hydrogen .

• Position of isotopes of all elements was not certain .

• Atomic mass did not increase in regulate manner in going from one element to the next.

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