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Question
Which among these are limitations of Mendeleev's periodic table?
Which among these are limitations of Mendeleev's periodic table?
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Solution
The correct options are
A Position of hydrogen
B Position of isotopes
C Similar elements paced separately
Hydrogen has been placed in 1A group with alkali metals, but certain properties of hydrogen resemble those of halogens. Isotopes, such as that of hydrogen, carbon, etc., have not been given separate places in the periodic table because of their similar properties. Also, some similar elements have been placed separately in Mendeleev's periodic table. For example, chemically similar elements like Cu an Hg have been placed in different groups.
A Position of hydrogen
B Position of isotopes
C Similar elements paced separately
Hydrogen has been placed in 1A group with alkali metals, but certain properties of hydrogen resemble those of halogens. Isotopes, such as that of hydrogen, carbon, etc., have not been given separate places in the periodic table because of their similar properties. Also, some similar elements have been placed separately in Mendeleev's periodic table. For example, chemically similar elements like Cu an Hg have been placed in different groups.
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