1.

The statement that is not correct for periodic classification of elements is:

Answer»

1. The properties of elements are periodic functions of their atomic numbers
2. Non-metallic elements are leser in NUMBER than metallic elements
3. The first ionisation energies of elements along a PERIOD do not vary in regular manner with increase in atomic number.
4. For transition elements, the d- subshells are filled with elements monotonically with increase in atomic number.

Solution :No regular order. For example
`Li lt Be, Be gt B, B lt C, C lt N, N gtO, O lt F`


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