| Ions |
Ions
Looking back at Table 3 indicates that all atoms have equal number of protons
(positively charged) and electrons (negatively charged) as a result of which the
net charge in the atom is 0.
But when any atom gains or loses one or more electrons we get atoms with
imbalance charge which are termed as ions. Ions can be positively charged
(loses electron) or negatively charged (gains electron).
Different charge states for Iron is
| Fe0 - neutral Fe+2
- Ferrous ion (loses 2 electrons)
Fe+3 - Ferric ion (loses 3 electrons) |
The atomic charge of various elements influences its chemical behavior. This
is clearly depicted in the periodic table. Elements of the same group have the
same charge on their ions.
|
Class
|
Position
|
Charge
|
Examples
|
|
Alkali metals |
Group IA |
+1
|
Na�++, K+�+, Cs+�+ |
|
Alkaline earth metals |
Group IIA |
+2
|
Mg2+�+,
Ca2+�+, Sr2�++ |
|
Halogens |
Group VIIA |
1
|
F-,
Cl-, Br-, I- |
|
Noble gases |
Group O |
-
|
He, Ne, Ar |
|
