Elements X, Y and Z have atomic numbers 19, 37 and 55 respectively. Which of the following statements is true?

  1. A

    Their ionisation potential would increase with the increasing atomic number

  2. B

    Y would have an ionisation potential in between those of X and Z

  3. C

    Z would have the highest ionisation potential

  4. D

    Y would have the highest ionisation potential

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    Solution:

    Elements X, Y and Z with atomic numbers 19,37,55 lie in group 1 (alkali metals). Within a group, IE decreases from top to bottom. Therefore, IE of Y could be between those of X and Z.

    Hence, the option B is correct

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