![]() Figure 3: The ionic radius decreases for the generation of positive ions.Īn anion, on the other hand, will be bigger in size than that of the atom it was made from because of a gain of an electron. A neutral atom X is shown here to have a bond length of 180 pm and then the cation X + is smaller with a bond length of 100 pm. This can similarly be said about the protons pulling the electrons closer to the nucleus, which as a result decreases atomic size.įigure 3 below depicts this process. If ten magnets and ten metallic objects represent a neutral atom where the magnets are protons and the metallic objects are electrons, then removing one metallic object, which is like removing an electron, will cause the magnet to pull the metallic objects closer because of a decrease in number of the metallic objects. An analogy to this can be of a magnet and a metallic object.It will also decrease because there are now less electrons in the outer shell, which will decrease the radius size. This will cause a decrease in atomic size because there are now fewer electrons for the protons to pull towards the nucleus and will result in a stronger pull of the electrons towards the nucleus. ![]()
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