Consider the elements with atomic numbers , and . Which of the following statements are CORRECT for — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

The atomic numbers 19 ($K$), 37 ($Rb$), 55 ($Cs$), and 87 ($Fr$) all correspond to Group 1 elements, which are known as alkali metals. They belong to the s-block and share the general outermost electronic configuration $ns^1$. They do not belong to Group 17 (halogens).