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 X⟶Z ionisation potential will decrease. Thus the false statements are A,B and C.