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Question

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

A
Their ionization potential would increase with increasing atomic number
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B
Y would have an ionization potential between those of X and Z
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C
Z would have the highest ionization potential
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D
Y would have the highest ionization potential
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Solution

The correct option is D Y would have the highest ionization potential
As the atomic numbers are 193755 we can see the elements are at a gap of 18 elements (K,Rb,Cs). Which means they are from three consecutive periods of same group. Thus, on moving down as ionic radii increases ionisation potential increases. So, from XZ ionisation potential will decrease. Thus the false statements are A,B and C.

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