Elements $X, Y$ and $Z$ have atomic numbers 19,37 and 55 respectively. Which of the following statem

Question

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

Professor PC Thomas Classes · Answer

(b) : 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 $Y$ is in between those of $X$ and $Z$.