Hello! Welcome to my blog. Today we will discuss about chemical species. lets start. If one molecule is identical to another, we can say they are the same chemical species. Ion: It is an atom or group of atoms having a charge on it. The charge may be positive or negative. There are two types of ions: Cations: An atom or group of atoms having positive charge on it is called cation. They are formed when atoms lose electron from their valance shells. Examples: Ca 2+ Ag + Al 3+ H 3 O + NH 4 + Hg 2 +2 Fe +2 Fe +3 Anions: An atom or group of atoms having negative charge on it is called anion. They are formed by gain or addition of electron to an atom. Examples: Cl – OH – I – Cr 2 O 7 -2 O -2 SO 4 -2 Molecular Ion: When a molecule loses or gain electron it forms a molecular ion. Free Radical: These are atoms or groups of atoms possessing odd number of unpaired electrons. It is represented by putting a dot over the symbol of a
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