Atoms and Ions Explained with Simple Animations

How do ions form?Ions form when atoms gain or lose electrons, creating particles with an electrical charge.Let's look at sodium, which has 11 electrons arranged in three shells.And chlorine, which has 17 electrons, including 7 in its outer shell.When an atom loses one or more electrons, it becomes positively charged, forming a cation.Sodium readily loses its outermost electron, becoming a positively charged sodium ion, or Na plus.Conversely, when an atom gains electrons, it becomes negatively charged, forming an anion.Chlorine readily gains an electron, becoming a negatively charged chloride ion, or Cl minus.Let's see what happens when sodium and chlorine atoms interact and transfer an electron.Initially, both atoms are neutral.Sodium's outer electron is transferred to chlorine's outer shell.After the transfer, sodium has a positive charge, and chlorine has a negative charge.This electron transfer follows the octet rule, where atoms tend to gain or lose electrons to achieve a full outer shell of eight electrons.Both ions are now more stable, with sodium having a complete second shell, and chlorine having a complete third shell of eight electrons.Ions form to achieve more stable electron configurations, following the octet rule.