Q2 of 40 Page 5

What were the limitations of Dobereiner's classification of elements ?

The limitation of Dobereiner's classification of elements:

Dobereiner could identify only three triads from the elements known at that time. So, all the elements could not be arragneged in the form of triads on the basis of their similar chemical properties.

More from this chapter

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11 Explain why the following statements are not correct?
i)  All groups contain both metals and non-metals
ii) In group I, reactivity decreases with increases in atomic number
iii) Elements in a period become more metallic with increasing atomic number
iv) Atoms of elements in the same group have the same number of electrons.  12 Why are the elements sodium and chlorine in the same period of the Periodic table? 3

What were the criteria used by Mendeleev in creating his periodic table ?

 4

The atomic number of an element is 12. State whether its oxide is acidic or basic.