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Q.

Atomic number of the 17th group element present in 7th period is

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a

117

b

85

c

115

d

113

answer is A.

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Detailed Solution

Astatine-AtZ=85 is present in 17th group and 6th period; So the next element in the group will have the atomic number=85+32=117; Z=117-Ts-Uus-Tennessine

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