Blue color of the periodic table image represent transition metal. Thus, option A is correct.
What are transition metal ?
The metal which have valence electrons that can participate in the formation of chemical bonds called as transition metal.
In a periodic table the position of transition metal is the long middle portions of the periodic table and form Groups 3 elements through 12.
These are paramagnetic metals, a good conductors of heat and electricity, in a solution their compounds are brightly colored when hydrated.
Every transition metal has multiple positive oxidation states, hard solid with high melting points and boiling points.
The elements are dense, less reactive but are good catalysts which form complexes with molecules called ligands.
Transition metal ions have incomplete filled d-orbitals, except for scandium
Some of the transition metals are iron, chromium, vanadium, titanium, cobalt, nickel, tungsten, gold, and platinum.
Thus option A is correct.
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