Period 6 is unusual in several ways.
Lanthanum (La), hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), and mercury are the period 6 transition metals (Hg).
<h3>Why Period 6 is unusual ?</h3>
The group of fifteen metallic chemical elements with atomic numbers 57 through 71, from lanthanum to lutetium, is known as the lanthanide or lanthanoid series (IUPAC nomenclature).
The phrase "rare-earth elements" refers to these fifteen elements as well as the chemically related elements scandium and yttrium.
Because it comprises a maximum of 32 elements, the sixth period is referred to be the longest period.
The nonmetals oxygen (O), sulfur (S), and selenium (Se), as well as the metalloid tellurium ( Te ) and the metal polonium, are classified as chalcogens in group 6A (or VIA) of the periodic table (Po).
The periodic table has a group of elements designated as Group 6 in IUPAC style. Chromium, molybdenum, tungsten, and sea-borgium are its constituent elements. While chromium, molybdenum, and tungsten are refractory metals, all of these are transition metals.
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