KCET · Chemistry · Structure of Atom
Elements \(X, Y\) and \(Z\) have atomic numbers 19,37 and 55 respectively. Which of the following statements is true about them ?
- A \(Y\) would have an ionisation potential between those of \(X\) and \(Z\).
- B \(Z\) would have the highest ionisation potential.
- C \(Y\) would have the highest ionisation potential.
- D Their ionisation potential would increase with increasing atomic number.
Answer & Solution
Correct Answer
(A) \(Y\) would have an ionisation potential between those of \(X\) and \(Z\).
Step-by-step Solution
Detailed explanation
Elements \(X, Y\) and \(Z\) with atomic number 19 , 37 and 55 respectively \(\mathrm{K}, \mathrm{Pb}\) and \(\mathrm{Cs}\). 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.
Therefore, statement \((a)\) is correct.
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