Question

Why valency of elements in specific group is same?
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Answer 1

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Periodic table was designed in such a manner to maintain the similar properties elements in the same group.  I WILL SAY MORE CLEARLY....

The number of electrons in an atom's outermost valence shell governs its bonding behavior. Therefore, elements whose atoms can have the samenumber of valence electrons are grouped together in the periodic table of the elements.

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Answer 2

The periodic table is arranged in such a way that the number of shells of an element determines its period and the number of valence electrons of an element determines its group.

So, we can conclude that same group elements have same valence elements.

So, group 1 elements have 1 valence electron

Similarly group 2 elements have 2 valence electrons and group 3 have 3 and so on upto group 7.

The number of valence electrons of elements belonging to same group is same.

So, the valency of elements belonging to same group is same.

Thus, a specific group elements have same valency.

Hope you understand my explanation.

I also hope this must helps you.