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<table bgcolor=beige border=2> <tr> <th colspan=8 align=center>Charge of Ion from Periodic Table</th> <tr> <tr> <th>1 (1A)</th> <th>2 (2A)</th> <th>13 (3A)</th> <th>14 (4A)</th> <th>15 (5A)</th> <th>16 (6A)</th> <th>17 (7A)</th> <th>18 (8A)</th> <tr> <tr> <th>H <sup>1+</sup></th> <th> </th> <th> </th> <th> </th> <th> </th> <th> </th> <th> </th> <th>He 0</th> <tr> <tr> <th>Li <sup>1+</sup></th> <th>Be NA</th> <th>B NA</th> <th>C <sup>4-</sup></th> <th>N <sup>3-</sup></th> <th>O <sup>2-</sup></th> <th>F <sup>1-</sup></th> <th>Ne 0</th> <tr> <tr> <th>Na <sup>1+</sup></th> <th>Mg <sup>2+</sup></th> <th>Al <sup>3+</sup></th> <th>Si NA</th> <th>P <sup>3-</sup></th> <th>S <sup>2-</sup></th> <th>Cl <sup>1-</sup></th> <th>Ar 0</th> <tr> <tr> <th>K <sup>1+</sup></th> <th>Ca <sup>2+</sup></th> <th>Ga <sup>3+</sup></th> <th>Ge NA</th> <th>As NA</th> <th>Se <sup>2-</sup></th> <th>Br <sup>1-</sup></th> <th>Kr 0</th> <tr> <tr> <th>Rb <sup>1+</sup></th> <th>Sr <sup>2+</sup></th> <th>In <sup>3+</sup></th> <th>Sn NA</th> <th>Sb NA</th> <th>Te NA</th> <th>I <sup>1-</sup></th> <th>Xe 0</th> <tr> <tr> <th>Cs <sup>1+</sup></th> <th>Ba <sup>2+</sup></th> <th>Tl <sup>3+</sup></th> <th>Pb NA</th> <th>Bi NA</th> <th>Po NA</th> <th>At NA</th> <th>Rn 0</th> <tr> <tr> <th>Fr <sup>1+</sup></th> <th>Ra <sup>2+</sup></th> <th></th> <th></th> <th></th> <th></th> <th></th> <th></th> <tr> </table> <tr> <b>Notes:</b><br> 1. NA indicates element does not have a specific charge.<br> 2. The d-block and f-block elements are not shown (do not have charges you get from Periodic Table)<br> 3. First row indicates the names of the column (also called groups or family)<br> (Ex. 1(1A) indicates Group 1 or sometimes called Group 1A)<br> <br> <br> <br> -------------------------------<br> <br> The [[scalar (mathematics)|scalar form]] of Coulomb's law will only describe the magnitude of the electrostatic force between two electric charges. If direction is needed as well, then the [[#Vector form|vector form]] is required. The magnitude of the electrostatic force (''F'') on a charge (''q''<sub>1</sub>) due to the presence of a second charge (''q''<sub>2</sub>), is given by :<math>F = k_\mathrm{e} \frac{q_1q_2}{r^2},</math> where ''r'' is the distance between the two charges and ''k''<sub>e</sub> a proportionality constant. A positive force implies a repulsive interaction, while a negative force implies an attractive interaction.<ref>[http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefor.html#c1 Coulomb's law], Hyperphysics</ref>
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