Question

Elements belonging to the same group have the same valency give scientific reason

Answer 1

because they are chemically same
you can also check their electronic configuration
like
lithium -atomic number=3 - 2, 1
sodium - atomic no. =7 -2,4,1
hence explained

Answer 2

Hi dear


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Yes bcz the elements having same chemical properties as well as physical properties that's why they have same valency....

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Hope it will definitely help u


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