Electrons are shared in different way in ionic and covalent bonds. Covalent bonds deserve to be non-polar or polar and also react come electrostatic charges.

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

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

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Polar covalent link analogy. One puppy is able to pull an ext on the bones, however both puppies still have a host 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. Once you look at a chart of water (see Fig. 3-2), you have the right to see that the two hydrogen atoms room not evenly distributed about the oxygen atom. The unequal share of electrons in between the atoms and the unsymmetrical shape of the molecule means that a water molecule has actually two poles - a confident charge on the hydrogen pole (side) and also a an adverse charge on the oxygen pole (side). Us say the the water molecule is electrically polar.

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Fig. 3-2: different ways that representing the polar sharing of electron in a water molecule. Every diagram shows the unsymmetrical shape of the water molecule. In (a) & (b), the polar covalent binding are shown as lines. In component (c), the polar covalent binding are displayed as electron dots mutual by the oxygen and also hydrogen atoms. In component (d), the diagram mirrors the loved one size of the atoms, and the binding are stood for by the emotional of the atoms.