Electrons room shared differently in ionic and covalent bonds. Covalent bonds have the right to be non-polar or polar and also react to electrostatic charges.

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Ionic bonds, like those in table salt (NaCl), are due to electrostatic attractive forces between their confident (Na+) and negative charged (Cl-) ions. In unit two, we compared atoms come puppies and electrons to bones in our analogy of just how bonding works. In ionic bonding, each puppy start out v an electron bone, yet one puppy acts like a thief and also steals the various other puppy’s bone (see Fig. 3-1a). Now one puppy has two electron bones and one puppy has none. Since the electron bones in ours analogy have a an unfavorable charge, the puppy thief becomes negatively charged because of the additional bone. The puppy that shed its electron bone i do not care positively charged. Since the puppy who lost his bone has the opposite charge of the thef puppy, the puppies are organized together by electrostatic forces, just like sodium and chloride ions!
In covalent bonds, like chlorine gas (Cl2), both atom share and hold strictly onto each other’s electrons. In our analogy, each puppy again beginning out with an electron bone. However, rather of one puppy steal the other’s bone, both puppies hold onto both bones (see Fig. 3-1b). 
Some covalently external inspection molecules, choose chlorine gas (Cl2), equally share their electrons (like 2 equally solid puppies each holding both bones). Other covalently bonded molecules, prefer hydrogen fluoride gas (HF), execute not share electron equally. The fluorine atom acts as a slightly more powerful puppy the pulls a bit harder top top the shared electrons (see Fig. 3-1c). Also though the electron in hydrogen fluoride are shared, the fluorine side of a water molecule pulls harder on the negatively charged shared electrons and becomes negative charged. The hydrogen atom has a slightly positively charge because it cannot organize as tightly to the an unfavorable electron bones. Covalent molecules with this type of uneven charge distribution are polar. Molecules with polar covalent bonds have a hopeful and negative side.
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Ionic shortcut analogy. The theif puppy has both skeleton (i.e. Both electrons). The various other puppy has actually lost its bone (electron). The puppies are held together since of the electrostatic pressure caused through their fee difference.

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non polar covalent bond analogy. Both puppies have actually an equal hold on both bones. No puppy has a charge; they space neutral.

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Polar covalent bond analogy. One puppy is able come pull more on the bones, yet both puppies still have actually a organize on both bones.

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Fig. 3-1: Bonding making use of a puppy analogy. In this analogy, every puppy represents an atom and each bone to represent an electron.
Water (H2O), prefer hydrogen fluoride (HF), is a polar covalent molecule. As soon as you look at a diagram of water (see Fig. 3-2), you have the right to see the the two hydrogen atoms are not same distributed approximately the oxygen atom. The unequal share of electrons between the atoms and also the unsymmetrical shape of the molecule means that a water molecule has two poles - a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole (side). We say that the water molecule is electrically polar.

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Fig. 3-2: various ways of representing the polar share of electrons in a water molecule. Each diagram reflects the unsymmetrical form of the water molecule. In (a) & (b), the polar covalent bonds are displayed as lines. In component (c), the polar covalent binding are shown as electron dots common by the oxygen and hydrogen atoms. In part (d), the diagram reflects the loved one size the the atoms, and also the bond are stood for by the emotional of the atoms.