Chemistry

covalent compounds are said to be polar when the shared electron moves towards the atom with the greater mass |  formed between a cation, which is usually a metal |   is a bond between twonon-metals with different electronegativities. |
 the atom towards which the electron pair shift gets slight negative charge, while the other atom acquires a slight positive charge | havea high melting point and tend to be soluble in water. | Only bonds between the same elements are truly nonpolar. The higher the difference in electronegativity, the more polar the bond is. |They have stronger intermolecular forces than a regular covalent bond | type of chemical bond formed through an electrostaticattraction between two oppositely charged ions. | electronsshared by the atoms spend a greater amount of time, on the average, closer to the Oxygen nucleus than the Hydrogen nucleus |
the polar covalent molecule has two centers of charge and this isknown as ‘dipole’ | solid state form lattice structures |  the geometry of the molecule and the great electronegativity difference between the Hydrogen atom and the Oxygen atom.  |
Theelectronegativity values must be 0.4 or greater |  ionic compounds are spherical | You should note this molecule is not an ion because there is no excess of proton or electrons |
They have apartial positive end and a partial negative end |  if the positive ion is small and/or highly charged, it will distort the electron cloud of the negative ion, an effect summarisedin Fajans' rules | The biological consequence of polar covalent bonds is that these kinds of bonds can lead to the formation of a weak bond called a hydrogen bond.  |
They share their electronsunevenly |  the atoms are bound by attraction of opposite ions, whereas | Polar covalent bonds are a particular type of covalent bond.  |
Cl-Cl
H-CH-O | NaCl,
NaOHAgCl | C6H6 NO3 F2  |