The element with atomic number 57 belongs to — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Electronic configuration of the element with atomic number 57 is, 1 2 5 6 Xe d s . Now, the block of the element will correspond to the shell which receives the last electron. Since the last electron is received by the 5d subshell, the block the given element belongs to is d. And the element belongs to 6th period and 3rd group. Hence, the element is Lanthanum.