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Titanium (Ti). Diagram of the nuclear composition and electron configuration of an atom of titanium-48 (atomic number: 22), the most common isotope of this element. The nucleus consists of 22 protons (red) and 26 neutrons (blue). Titanium is a transition metal in group 4, period 4, and the d-block of the periodic table. It has a melting point of 1668 degrees Celsius. The trends across the transition metals are due to electrons filling an inner d-subshell (here, within the 3rd ring), shielding the outer electrons from the increasing nuclear charge.
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