FACTOID # 136: Nauru, Tokelau and Western Sahara are the only three countries without official capital cities.
 
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Encyclopedia > Electron Dot Structure

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NationMaster - Encyclopedia: Valence bond theory (1794 words)
A valence bond structure is similar to a Lewis structure, however where a single Lewis structure cannot be written, several valence bond structures are used.
Electron atomic and molecular orbitals, showing among others the sigma bond of two s-orbitals and a sigma bond of two p-orbitals In chemistry, sigma bonds (σ bonds) are a type of covalent chemical bond.
Electron atomic and molecular orbitals, showing a Pi-bond at the bottom right of the picture In chemistry, pi bonds (Ï€ bonds) are bonds with a single nodal plane containing the line segment between the two atoms.
#1 Site For Learning Chemistry (618 words)
The electronic configuration of Na has 2 electrons in the first orbit (K shell), 8 electrons in the second orbit (L shell) and only one electron in the third (M shell).
The electronic configuration of Cl has 2 electrons in the K shell, 8 electrons in the L shell and 7 electrons in the M shell.
The ion that looses an electron is called a positive ion or a cation.
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