Electrons are shared differently in ionic and also covalent bonds. Covalent bonds can be non-polar or polar and also react to electrostatic charges.

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Ionic bonds, choose those in table salt (NaCl), are as a result of electrostatic attrenergetic forces in between their positive (Na+) and also negative charged (Cl-) ions. In unit two, we compared atoms to puppies and also electrons to bones in our analogy of just how bonding functions. In ionic bonding, each puppy starts out with an electron bone, yet one puppy acts choose a thief and steals the other puppy’s bone (view Fig. 3-1a). Now one puppy has two electron bones and one puppy has none. Due to the fact that the electron bones in our analogy have an adverse charge, the puppy thief becomes negatively charged due to the added bone. The puppy that shed its electron bone becomes positively charged. Because the puppy who shed his bone has the opposite charge of the thief puppy, the puppies are held together by electrostatic forces, just favor sodium and also chloride ions!
In covalent bonds, favor chlorine gas (Cl2), both atoms share and also host tightly onto each other’s electrons. In our analogy, each puppy again starts out through an electron bone. However, instead of one puppy stealing the other’s bone, both puppies hold onto both bones (see Fig. 3-1b). 
Some covalently bonded molecules, prefer chlorine gas (Cl2), equally share their electrons (prefer two equally strong puppies each holding both bones). Other covalently bonded molecules, choose hydrogen fluoride gas (HF), perform not share electrons equally. The fluorine atom acts as a slightly stronger puppy that pulls a little bit harder on the mutual electrons (see Fig. 3-1c). Even though the electrons in hydrogen fluoride are common, the fluorine side of a water molecule pulls harder on the negatively charged common electrons and becomes negatively charged. The hydrogen atom has a slightly positively charge because it cannot organize as tightly to the negative electron bones. Covalent molecules through this form of unalso charge circulation are polar. Molecules via polar covalent bonds have actually a positive and negative side.
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Ionic bond analogy. The thief puppy has actually both bones (i.e. both electrons). The various other puppy has actually shed its bone (electron). The puppies are held together bereason of the electrostatic pressure brought about by their charge distinction.

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Non polar covalent bond analogy. Both puppies have an equal organize on both bones. Neither puppy has actually a charge; they are neutral.

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

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Fig. 3-1: Bonding utilizing a puppy analogy. In this analogy, each puppy represents an atom and each bone represents an electron.
Water (H2O), like hydrogen fluoride (HF), is a polar covalent molecule. When you look at a diagram of water (watch Fig. 3-2), you can watch that the 2 hydrogen atoms are not evenly dispersed roughly the oxygen atom. The unequal sharing of electrons between the atoms and the unsymmetrical form of the molecule implies that a water molecule has 2 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: Different ways of representing the polar sharing 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 bonds are displayed as electron dots mutual by the oxygen and hydrogen atoms. In component (d), the diagram reflects the loved one dimension of the atoms, and the bonds are stood for by the touching of the atoms.