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Clash Royale CLAN TAG #URR8PPP "Covalent" redirects here. For other uses, see Covalent (disambiguation). A covalent bond forming H 2 (right) where two hydrogen atoms share the two electrons A covalent bond , also called a molecular bond , is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs , and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding. [1] [ better source needed ] For many molecules, the sharing of electrons allows each atom to attain the equivalent of a full outer shell, corresponding to a stable electronic configuration. Covalent bonding includes many kinds of interactions, including σ-bonding, π-bonding, metal-to-metal bonding, agostic interactions, bent bonds, and three-center two-electron bonds. [2] [3] The term covalent bond dates from 1939. [4] The prefix co- means jointly, assoc...

Clash Royale CLAN TAG #URR8PPP 政治系列的一部份 行政機構 國家元首 君主 總統 最高領導人 國家主席 國務委員會主席 政府 政府首長 總理 首相 部長會議主席 首席部長 總督 行政長官 內閣 集體負責制 部 部長 大臣 國務卿 其他 省長 市長 知事 縣長 黨和國家最高領導人 制度 總統制 半總統制 議會制 (西敏制) 一黨制 軍事...

Clash Royale CLAN TAG #URR8PPP Types of radii Atomic radius Ionic radius Covalent radius Metallic radius Van der Waals radius v t e Metallic bonding is a type of chemical bonding that rises from the electrostatic attractive force between conduction electrons (in the form of an electron cloud of delocalized electrons) and positively charged metal ions. It may be described as the sharing of free electrons among a lattice of positively charged ions (cations). Metallic bonding accounts for many physical properties of metals, such as strength, ductility, thermal and electrical resistivity and conductivity, opacity, and luster. [1] [2] [3] [4] Metallic bonding is not the only type of chemical bonding a metal can exhibit, even as a pure substance. For example, elemental gallium consists of covalently-bound pairs of atoms in both liquid and solid state—these pairs form a crystal lattice with metallic bonding between them. Another example of a metal–metal covalent bond is mercuro...