Question

Mention the demerits of Mendleev's periodic table.
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Answer 1

Answer:

Demerits of Mendeleev Periodic Table

ʜᴇ ᴡᴀꜱ ᴜɴᴀʙʟᴇ ᴛᴏ ʟᴏᴄᴀᴛᴇ ʜyᴅʀᴏɢᴇɴ ɪɴ ᴛʜᴇ ᴩᴇʀɪᴏᴅɪᴄ ᴛᴀʙʟᴇ.

ɪɴᴄʀᴇᴀꜱᴇ ɪɴ ᴀᴛᴏᴍɪᴄ ᴍᴀꜱꜱ ᴡᴀꜱ ɴᴏᴛ ʀᴇɢᴜʟᴀʀ ᴡʜɪʟᴇ ᴍᴏᴠɪɴɢ ꜰʀᴏᴍ ᴏɴᴇ ᴇʟᴇᴍᴇɴᴛ ᴛᴏ ᴀɴᴏᴛʜᴇʀ. ...

ʟᴀᴛᴇʀ ᴏɴ, ɪꜱᴏᴛᴏᴩᴇꜱ ᴏꜰ ᴇʟᴇᴍᴇɴᴛꜱ ᴡᴇʀᴇ ꜰᴏᴜɴᴅ ᴡʜɪᴄʜ ᴠɪᴏʟᴀᴛᴇᴅ ᴍᴇɴᴅᴇʟᴇᴇᴠ'ꜱ ᴩᴇʀɪᴏᴅɪᴄ ʟᴀᴡ.

Answer 2

Answer:

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.

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