Q2 of 49 Page 145

What Is the basis for the classification of modem periodic table?

Elements were arranged in the increasing order of their atomic numbers. This leads to the modern periodic law that the properties of elements are the periodic function of their atomic numbers.


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6

A metal M forms an oxide having the formula M2O3. It belongs to the third period in the modern periodic table. Write the atomic number and valency of the metal.

 1

Among the following elements F, Cl, Br and I, which does not fit in Dobereiner’s triad.

 3

Name the two elements whose valencies are equal to their group number.

 4

Which element comes after (right) lithium in the periodic table?