Electrons space shared in different way in ionic and covalent bonds. Covalent bonds can be non-polar or polar and react come electrostatic charges.

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Ionic bonds, prefer those in table salt (NaCl), are as result of electrostatic attractive forces in between their confident (Na+) and an adverse charged (Cl-) ions. In unit two, we contrasted atoms come puppies and electrons come bones in our analogy of exactly how bonding works. In ionic bonding, each puppy start out through an electron bone, but one puppy acts prefer a thief and also steals the other puppy’s bone (see Fig. 3-1a). Currently one puppy has actually two electron bones and one puppy has actually none. Due to the fact that the electron bones in ours analogy have actually a an unfavorable charge, the puppy thief i do not care negatively charged due to the extr bone. The puppy that shed its electron bone becomes positively charged. Because the puppy who lost his bone has actually the opposite charge of the thief puppy, the puppies are held together through electrostatic forces, similar to sodium and chloride ions!
In covalent bonds, like chlorine gas (Cl2), both atom share and hold tightly onto every other’s electrons. In our analogy, each puppy again starts out with an electron bone. However, instead of one puppy steal the rather bone, both puppies organize onto both bones (see Fig. 3-1b). 
Some covalently bonded molecules, choose chlorine gas (Cl2), same share their electrons (like 2 equally strong puppies each holding both bones). Various other covalently bonded molecules, prefer hydrogen fluoride gas (HF), execute not share electron equally. The fluorine atom acts as a slightly stronger puppy that pulls a little bit harder ~ above the shared electrons (see Fig. 3-1c). Even though the electrons in hydrogen fluoride are shared, the fluorine side of a water molecule pulls harder on the negative charged shared electrons and also becomes negatively charged. The hydrogen atom has a slightly positively charge due to the fact that it cannot hold as tightly to the negative electron bones. Covalent molecules with this form of uneven charge distribution are polar. Molecules v polar covalent bonds have actually a optimistic and negative side.
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Ionic link analogy. The thef puppy has both skeletal (i.e. Both electrons). The other puppy has actually lost that is bone (electron). The puppies are held together because of the electrostatic force caused through their fee difference.

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no polar covalent bond analogy. Both puppies have an equal hold on both bones. Neither puppy has actually a charge; they room 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 actually a host on both bones.

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Fig. 3-1: Bonding using a puppy analogy. In this analogy, each puppy to represent an atom and also each bone to represent an electron.
Water (H2O), like hydrogen fluoride (HF), is a polar covalent molecule. When you look at a diagram of water (see Fig. 3-2), you have the right to see that the 2 hydrogen atoms room not evenly distributed roughly the oxygen atom. The unequal sharing of electrons between the atoms and the unsymmetrical form of the molecule means that a water molecule has two poles - a optimistic charge ~ above the hydrogen pole (side) and a negative charge on the oxygen pole (side). We say the the water molecule is electrically polar.

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Fig. 3-2: different ways of representing the polar sharing of electron in a water molecule. Each diagram shows the unsymmetrical form of the water molecule. In (a) & (b), the polar covalent bond are shown as lines. In part (c), the polar covalent bonds are shown as electron dots common by the oxygen and hydrogen atoms. In component (d), the diagram shows the family member size of the atoms, and the binding are stood for by the touching of the atoms.