D And F Block, Chemistry, Short Notes, 12 Class.
actinoids are radioactive elements. Lanthanoids General characteristics include: ➭ Electronic configuration [Xe] 4f1–14, 5d0–1, 6s2. ➭ Decrease in atomic and ionic size from left to right due to lanthanoid contraction. ➭ Silvery white, soft metals that tarnish easily in air. ➭ Many trivalent