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Modern Periodic Law

Why did Mende...

Question

Why did Mendeleev leave some gaps in his periodic table ?

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Solution

The gaps were left for undiscovered elements then.

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Q. (a) Why did Mendeleev leave gaps in his periodic table?
(b) State any three limitations of Mendeleev's classification.
(c) How does electronic configurations of atoms change in a period with increase in atomic number?

Q. (a) Why do we classify elements?
(b) What were the two criteria used by Mendeleev in creating his Periodic Table?
(c) Why did Mendeleev leave some gaps in his Periodic Table?
(d) In Mendeleev's Periodic Table, why was there no mention of Noble gases such as Helium, Neon and Argon?
(e) Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.

Q. Why did Mendeleev leave some gaps in his Periodic Table?

why mendeleev did noy assign a fixed position to hydrogen in his periodic table

Q. Mendeleev predicted the existence of some elements that had not been discovered at that time and left some gaps in his periodic table. What are the names that he gave to the two undiscovered elements, gallium and germanium, respectively?

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