Question

Write the merits and demerits of mendeleevs periodic table state the mendeleevs periodic law ​

Answer 1

Advantage of Mendeleev Periodic Table :-

1.He left blank Places which help scientist to discover new element

2.When Noble gasses was discovered Hel could add it to periodic table without any major changle

3.He predicted the property of new element

Disadvantages :-

1. Couldn't explain position of Hydrogen

2.Couldn't answer the question "Can we have an element with atomic mass 3 between Hydrogen and Helium

3 He placed cobalt before Nickel though Cobalt has more mass

Answer 2

1)Merits of Mendeleevs periodic table

A) Atomic masses of some elements were revised so as to give them proper place in the modern periodic table in accordance with their properties. For Ex-the previously determined that atomic masses of beryllium, 14.09,was changed to the correct value 9.4,and beryllium was placed before boron.
B) Mendeleev kept vacant place in periodic table for elements nothing discovered. Three of these unknown elements were Given in the name eka -boron, eka -aluminium and eka -silicon and atomic masses were indicated as 44,68and 72,respectively.Later on these elements were discovered and named as scandium, gallium and germinium respectively. The properties of these elements matched well with those predicated by Mendeleev.
C) There was no place reserved for noble Hades in Mendeleevs periodic table. so Mendeleev created the zero group without disturbing the original periodic table in which the noble gases were fitted very well.
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