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The nuclei of elements X,Y and Z have sa...

The nuclei of elements X,Y and Z have same number of protons, but different nembers of neutrons. According to Mendeleef periodic table, the elements X,Y and Z

A

belong to same group and same period

B

belong to different groups and different periods

C

belong to same groupand different periods

D

are isotopes, which do not have different positions

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KVPY PREVIOUS YEAR-MOCK TEST 1-EXERCISE
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