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Q.
Elements $X, Y$ and $Z$ have atomic numbers $19,37$ and $55$ respectively. Which of the following statements is true about them?
Classification of Elements and Periodicity in Properties
Solution:
Elements $X, Y$ and $Z$ with atomic numbers $19,37,55$ lie in group $ 1$ (alkali metals). Within a group, $I E$ decreases from top to bottom. Therefore, $I E$ of $Y$ could be between $X$ and $Z$.