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KCET2022ChemistryStructure of Atom

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

Options

  1. AY would have an ionisation potential between those of X and Z .
  2. BZ would have the highest ionisation potential.
  3. CY would have the highest ionisation potential.
  4. DTheir ionisation potential would increase with increasing atomic number.

Correct answer

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

Step-by-step solution

Elements X, Y and Z with atomic number 19 , 37 and 55 respectively K , Pb and Cs . These elements are belongs to group-I of periodic table. On moving down the period in group-l ionisation potential will decrease down the group. Thus, the order is X>Y>Z . Therefore, statement (a) is correct.

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