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Q.

All the elements in one _____ have the same valency.

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a

Period

b

Group and period

c

Group

d

None of the above

answer is A.

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Detailed Solution

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The elements of same group have similar chemical properties because they have same number of valence electrons and valency.

For eg: Li has 1 valence electron and so does NA,K and Cs. Hence they have similar properties.

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