Pt
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Palladium (Pd) is the sixth period transition element with properties similar to nickel (Ni). They both have similar atomic size, melting points, and ability to form complexes with ligands due to their filled d orbitals.
Pd (palladium) is a sixth-period transition element with properties similar to Ni (nickel). Both metals have similar atomic structures and exhibit comparable chemical reactivity, especially in forming coordination complexes. Additionally, they share physical properties such as similar melting and boiling points.
Sulfur is a fourth period representative element that has similar properties to oxygen. Both elements belong to group 16 of the periodic table, also known as the oxygen group, and have similar chemical reactivity.
The element that fits this description is chlorine, which is a highly reactive halogen with properties similar to those of magnesium. Chlorine is located in the same period as bromine (Group 17, Period 4) in the periodic table.
Cobalt is a transition metal in the periodic table. It belongs to Group 9 and Period 4.
The element in group 3 and period 4 of the periodic table is scandium, with the atomic number 21. It is a silvery-white transition metal known for its lightweight properties and is commonly used in aerospace industry and sports equipment.