Why is it logical to end a period in the modern periodic table?

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Solution

In Modern periodic table, at the end of each period, the valence shell is completely filled.
On moving from left to right in a period, the number of valence electrons increases from 1 to 8.
After end of first period next element has valence 1,it should çome under 1st group in next period.

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(a) State modern periodic law.

(b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table?

(d) Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?

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