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Question

An element X decays into element Z by two-step process.
XY+42He
YZ+2¯e then
  1. X and Z are isobars
  2. X and Z are isotones
  3. X and Y are isotopes
  4. X and Z are isotopes

A
X and Z are isotones
B
X and Z are isobars
C
X and Y are isotopes
D
X and Z are isotopes
Solution
Verified by Toppr

Let atomic number and mass number of X be Z and A, respectively.
First step of reaction : AZXA4Z2Y+42He
Second step of reaction : A4Z2YA4ZZ+2 01e
Atoms of elements having same atomic number and different mass number are known as isotopes.
Thus X and Z are isotopes.

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