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

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no polar covalent link analogy. Both puppies have an equal host on both bones. Neither puppy has actually a charge; they space neutral.

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Polar covalent bond analogy. One puppy is able come pull an ext on the bones, but both puppies still have 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 also each bone to represent an electron.
Water (H2O), choose hydrogen fluoride (HF), is a polar covalent molecule. When you look at a chart of water (see Fig. 3-2), you deserve to see the the two hydrogen atoms are not same distributed roughly the oxygen atom. The unequal sharing of electrons in between the atoms and the unsymmetrical shape of the molecule method that a water molecule has actually two poles - a positive charge ~ above the hydrogen pole (side) and a an adverse charge top top the oxygen pole (side). We say that the water molecule is electrically polar.

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Fig. 3-2: different ways of representing the polar share of electron in a water molecule. Each diagram shows the unsymmetrical shape of the water molecule. In (a) & (b), the polar covalent bonds are shown as lines. In part (c), the polar covalent binding are presented as electron dots common by the oxygen and hydrogen atoms. In component (d), the diagram shows the relative size that the atoms, and the binding are represented by the poignant of the atoms.