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The first transition series is present in the 4th period, and starts after Ca (Z = 20) of group 2 with the configuration [Ar]4s 2, or scandium (Sc), the first element of group 3 with atomic number Z = 21 and configuration [Ar]4s 2 3d 1, depending on the definition used. As we move from left to right, electrons are added to the same d subshell ...
A period 6 element is one of the chemical elements in the sixth row (or period) of the periodic table of the chemical elements, including the lanthanides.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that elements ...
Lutetium is a chemical element; it has symbol Lu and atomic number 71. It is a silvery white metal , which resists corrosion in dry air, but not in moist air. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earth elements ; it can also be classified as the first element of the 6th-period ...
Period 5 has the same number of elements as period 4 and follows the same general structure but with one more post transition metal and one fewer nonmetal. Of the three heaviest elements with biological roles, two ( molybdenum and iodine ) are in this period; tungsten , in period 6, is heavier, along with several of the early lanthanides .
Group 6, numbered by IUPAC style, is a group of elements in the periodic table. Its members are chromium (Cr), molybdenum (Mo), tungsten (W), and seaborgium (Sg). These are all transition metals and chromium, molybdenum and tungsten are refractory metals .
The second-lightest exclusively radioactive element, promethium, has atomic number 61. [32] Atomic nuclei with an odd number of protons are less stable than those with even numbers, even when the total number of nucleons (protons + neutrons) is even, [57] and odd numbered elements have fewer stable isotopes.
For example, the atomic radius of the metal zirconium, Zr (a period-5 transition element), is 155 pm [11] (empirical value) and that of hafnium, Hf (the corresponding period-6 element), is 159 pm. [12] The ionic radius of Zr 4+ is 84 pm and that of Hf 4+ is 83 pm. [13] The radii are very similar even though the number of electrons increases ...
Neodymium is a chemical element; it has symbol Nd and atomic number 60. It is the fourth member of the lanthanide series and is considered to be one of the rare-earth metals . It is a hard , slightly malleable , silvery metal that quickly tarnishes in air and moisture.