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

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Their ionization potential would increase with increasing atomic number

'Y' would have an ionization potential between those of X and Z.

Z would have the highest ionization potential

Y would have the highest ionization potential

answer is B.

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Detailed 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.

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