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Q.

X is an element of the modern periodic table. It is surrounded by elements having atomic number 17. 34, 36 and 53. Which among these do not belong to the same period as that of X?

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a

Atomic number 34 and 36

b

Atomic number 36 and 53

c

Atomic number 17 and 36

d

Atomic number 17 and 53

answer is D.

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Detailed Solution

Atomic number 17 and 53 do not belong to the same period as that of X.
As, the atomic number of X can be deduced to 35. It belongs to group 17 and 4th period. Elements with atomic numbers 17 and 53 belong to the same group (group 17) as that of X. But they are placed in different periods. Elements with atomic number 34 and 36 belong to same period as that of X.

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