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The d-block, with the d standing for "diffuse" and azimuthal quantum number 2, is in the middle of the periodic table and encompasses elements from groups 3 to 12; it starts in the 4th period. Periods from the fourth onwards have a space for ten d-block elements.
Since the electrons added fill the (n − 1)d orbitals, the properties of the d-block elements are quite different from those of s and p block elements in which the filling occurs either in s or in p orbitals of the valence shell. The electronic configuration of the individual elements present in all the d-block series are given below: [31]
Superactinides – Hypothetical series of elements 121 to 157, which includes a predicted "g-block" of the periodic table. Transactinide elements – Elements after the actinides (atomic number greater than 103). Transplutonium elements – Elements with atomic number greater than 94. Transuranium elements – Elements with atomic number ...
d-block [271] (27–29) – – – – – synthetic unknown phase 109 Mt Meitnerium: Lise Meitner, Austrian physicist 9 7 d-block [278] (27–28) – – – – – synthetic unknown phase 110 Ds Darmstadtium: Darmstadt, Germany, where it was first synthesized in the GSI labs 10 7 d-block [281] (26–27) – – – – – synthetic unknown ...
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
Elements with similar chemical properties generally fall into the same group in the periodic table, although in the f-block, and to some respect in the d-block, the elements in the same period tend to have similar properties, as well.
p-block → #fdff8c d-block → #99ccff f-block → #9bff99 g-block → #fd99ff h-block → #7ed9d9 i-block → #e0c880 The blocks beyond f are only theoretical as the corresponding elements have not been discovered yet (and for h and i, they might not even exist).
Elements of the group have one s-electron in the outer electron shell. Hydrogen is not considered to be an alkali metal as it is not a metal, though it is more analogous to them than any other group. This makes the group somewhat exceptional. b The 14 f-block groups (columns) do not have a group number.