UN Blog: Ionic bonds /covalent on periodin table? and Bond University

Tuesday, April 29, 2014

Ionic bonds /covalent on periodin table? and Bond University

Ionic bonds /covalent on periodin table?

Ionic bonds /covalent on periodin table?
list all possible ion bonds on the periodic table
which pairs are most likely to form ionic bonds? explain why.
''' '' covalent bonds? explain why.
whih are least likely to perform any type of bond?explain why?

Bond best answer:

Answer by lizbelle_28
Covalent bonding is a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms, or between atoms and other covalent bonds. In short, attraction-to-repulsion stability that forms between atoms when they share electrons is known as covalent bonding.

The most common type of covalent bond is the single bond, the sharing of only one pair of electrons between two atoms. It usually consists of one sigma bond. All bonds with more than one shared pair are called multiple bonds.

Sharing two pairs is called a double bond. An example is in ethylene (between the carbon atoms). It usually consists of one sigma bond and one pi bond.

Sharing three pairs is called a triple bond. An example is in hydrogen cyanide (between C and N). It usually consists of one sigma bond and two pi-bonds.

Quadruple bonds are found in the transition metals. Molybdenum and rhenium are the elements most commonly observed with this bonding configuration. An example of a quadruple bond is also found in Di-tungsten tetra(hpp).

Quintuple bonds have been found to exist in certain dichromium compounds.

The only known molecules with true sextuple bonds (order 6) are diatomic Mo2 and W2, in the gaseous phase at very low temperatures. Although diatomic Cr2 and U2 have formal structures with twelve-electron bonds, their effective bond orders (derived from quantum chemistry calculations) are less than 5. There is strong evidence to believe that no two elements in the periodic table can form a bond with greater order than 6.[6]

An ionic bond (or electrovalent bond) is a type of chemical bond based on electrostatic forces between two oppositely-charged ions. In ionic bond formation, a metal donates an electron, due to a low electronegativity to form a positive ion or cation. In ordinary table salt (NaCl), the bonds between the sodium and chloride ions are ionic bonds. Often ionic bonds form between metals and non-metals. The non-metal atom has an electron configuration just short of a noble gas structure. They have high electronegativity, and so readily gain electrons to form negative ions or anions. The two or more ions are then attracted to each other by electrostatic forces.