摘要
<正>Elements in the periodic table are classified into s-and p-block main-group elements, d-block transition metals and f-block lanthanides and actinides according to the valence atomic orbitals (AOs).Main-group elements form bonds using their ns and np valence orbitals, following the octet rule—a well-known chemical rule which states that atoms tend to bond in such a way that each atom has a closed-shell 18-electron configuration like noble gases. Besides one ns and three np valence orbitals, transition metals have additional five (n-1)d orbitals. This leads
引文
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