Formation of Ion
- An ion is an atom or group of atoms carrying positive or negative charge. Example Ca2+, O2-, SO42- etc.
- If a particle has equal numbers of protons (+) and electrons (-), the particle charge is zero, and the particle is said to be neutral.
- In a chemical reaction, electron(s) can be transferred from atom to another atom.
- If electron(s) is removed from an atom, the number of protons will be more than number of electrons. In this case, the atom will has excess positive charge and hence form a positive ion (cation).
(An atom losses electron to form positive ion)
- If an atom gains electrons, there is an excess negative charge in the atom, so a negative ion is formed.
- In other words,
- The atom losing electrons forms a positive ion (cation) and is usually a metal.
- The atom gaining electrons forms a negative ion (anion) and is usually a non-metallic element.
Difference Between an Atom and an Ion That Have Same Electrons Arrangement
Difference Between Fluoride Ion and Neon Atom
- After forming an ion, the electron arrangement of the ion is similar to the noble gases.
- For example, the electron arrangement of fluoride ion is 2.8 which is similar to a Neon atom, 2.8.
- Fluoride ion and the neon atom have similar electron arrangement.
- Fluoride ion carries charge whereas neon atom is neutral.
|(The electrons arrangement of a fluoride ion is the same as a neon atom. However, they are so much different chemically)|