Question

What
are the
of the merits
and demerits of
Mendeleev's periodic table?​

Answer 1

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Merits of Mendeleev Periodic Table

• Some gaps were left for the elements yet to be discovered. Thus, if a certain new element is discovered, it can be placed in a new group without disturbing any existing group.

Demerits of Mendeleev Periodic Table

• He was unable to locate hydrogen in the periodic table.
• Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable.
• Later on, isotopes of elements were found which violated Mendeleev’s periodic law.

Answer 2

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★ What are the merits and demerits of the Mendeleev’s periodic table?

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❁ merits:-

• arranged elements in rows called periods and columns called groups

• he arranged elements based of their properties and atomic mass

• helped find new elements as Mendeleev had left spaces for these “probably” yet to be discovered elements and even gave the properties of the same which were later found true . eg;gallium(eka Al) and germanium (eka Si)

• his predictions came out sucessful

❀ demerits:-

• He didn’t know where to place hydrogen as it possessed a dual nature of both alkali metals and halogens

• He arranged elements according to atomic mass but at places placed elements with more atomic weight before a lighter one .so his table was modified by using atomic number instead of atomic mass to the present “modern periodic table “

❄︎ Hᴏᴘᴇ ɪᴛ Hᴇʟᴘs !