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Molecules and Atomicity

why hydrogen ...

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why hydrogen does not have a definite position in periodic table

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Q. (a) In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
(b) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?

The position of hydrogen in the periodic table is still not satisfactory.Explain

Q. In the modern periodic table which one of the following does not have an appropriate position?

Q. (a) Which two criteria did Mendeleev use to classify the elements in his periodic table?
(b) State Mendeleev's periodic law.
(c) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?
(d) How and why does the atomic size vary as you go:
(i) from left to right along a period?
(ii) down a group?

The position of hydrogen in the modern periodic table is not fixed.

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