It is the distance from the nucleus of an atom to the last electron (the farthest) in its electron

* Ionization energy: the energy required for taking one electron from the last atom in its gaseous state. Can also be called ionization potential. Briefly: The amount of energy required temazcal boston menu to ionize a compound able. - Why last electron? With "last" electron is meant the farthest electron core. The closer the electron is the core, the electrostatic force (electrostatic force *: There force of attraction between oppositely charged or repulsion of like charges) will be exerted on it by the core. Because the core is filled with positive charges. So most will be the electrostatic force - the force of attraction between the charges and the core of an electron that is closer to it than the one that is farther away (in a layer farther). For this nearest electron core will be much harder to push him away from the core enough to him out of the electron than for one that is already far into it.
* In electronic distribution diagram taken by Linus Pauling: the "last" electron, which can be found in the distribution, is always the one with more power. temazcal boston menu Often it is in the existing layer and sublevel temazcal boston menu farther in the electron that atom. But this is not a rule. As can be seen looking at the diagram below, the 10 electrons in the d subshell level 4, for example, will be more energetic than the two electrons at level 5 (layer above) in the s sublevel. We will see why later. To extract an electron from the electron is near the core would require more energy than a more distant electron (as it would be a more difficult situation), this electron would have to receive enough energy to get to distance from the core to the point of exit of the electron that atom (to the point where the electrostatic force of the nucleus has no effect). And then takes more energy to pull electrons closer to the nucleus than the more distant process, naturally those who come out first, if any are out (if the atom gain energy), temazcal boston menu will be what is farther away, it will be easier for him (easier = quicker to happen, then first occur than others). * When an electron is from the nucleus, it has more freedom to move (the force of attraction is less about him), moving faster and faster temazcal boston menu than others, then it is consequently more energy. So the farther away from the core electrons are, they will be more energetic.
It is the distance from the nucleus of an atom to the last electron (the farthest) in its electron cloud. - Small atomic radius: mean its electrons have greater temazcal boston menu proximity to the nucleus temazcal boston menu (eg by having the least amount of electrons to other atoms), this element will need more energy to ionize (more energy to remove electrons from the atom). * Remember: temazcal boston menu To know if something is small need of a reference, the atomic temazcal boston menu radius may be small compared to the atomic radius of another atom. To make the comparison between the atomic radii will first have to know what is the amount of layers of electrons in the electron, because the more layers of electrons, the greater the electron cloud. For example: Between Na (sodium) and Ba (barium). To know how many layers the Na has, one can simply look at the table which row it belongs (---, are called the horizontal straight lines of the periodic table), temazcal boston menu the elements are distributed in the table so that each row represents the amount layers of electrons they have in their eletrosferas temazcal boston menu (around their nuclei). Then an element in the first row will have only one layer of electrons (which temazcal boston menu is a small atomic radius compared to the other possibilities). - Na is the third line (the horizontal lines of the table - lines), also called the third period. This means that every atom of Sodium have 3 layers of electrons around its nucleus. - The Ba is in the sixth line, which says it has 6 layers of electrons around its nucleus, so a much larger atomic radius than Na. * Response: This shows that Ba theoretically has a higher ability to ionize than the On when compared under the same conditions. The ionization energy that would be required for the Ba (Ba atom to turn on ion) would be smaller than that of Na. => If the two elements temazcal boston menu belong to the same line so that both have the same layers can still know which has the largest atomic radius just looking at the periodic table. For example: OK (potassium) and Br (bromine) is in the fourth period of the periodic table. Then have the same number of layers of electrons, but Bromo has 45 protons in the nucleus, while potassium is only 19. The electrostatic force exerted on the electrons by the nucleus of Bromine (with its 45 protons and 4 layers) is much greater temazcal boston menu than that exerted by the 19 protons of Potassium on Tambe