There are 10 e- in a d sublevel and there are 10 elements in the d block. Less reactive that GI and II elements. Some, such as Au, Pt, Ag, Cu are found free in nature and are so unreactive that they do not easily form comp with other elements. Tungsten has the highest MP of all the metals and is used as filaments in light bulbs. Ag comp are sensitive to light and are used in film.
Color is a common feature of the transition metal ions.
E. f block elements 1. There are 14 f block elements in the 6 and 7 periods 2. These are called periodic trends. A. Atomic radii 1. The size of an atom is not a definite quantity.