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

Z would have the highest ionization
potential

Their ionization potential would increase
with increasing atomic number

Y would have the highest ionization
potential

answer is B.

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Detailed Solution

It is given that X, Y and Z have atomic numbers 19,37 and 55 respectively. It means they all belong to Group 1 i.e, Alkali metals.

We know that Ionization energy decreases as we move down the group.

Therefore, from the above observation we can say that 'Y ' would have an ionisation potential between those of X and Z.

Hence, option(b) is the answer.

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