The element Lanthanum () with atomic number 57 belongs to which block of the modern periodic table? — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Lanthanum ($Z=57$) has the configuration $[Xe] 5d^1 6s^2$. The last electron enters the d-subshell, making it a d-block element, though it closely resembles the lanthanides that follow it.