When we think
about matter then cross over the question,
Why matter exists in the form of molecules, How
do atoms combine to form a molecule and Why do atoms form bonds?
Answer is very
simple; everything in nature wants becomes stable.
Therefore, a molecule will only be formed if it is MORE
STABLE and has LOWER ENERGY.
“Chemical
bond is the force which holds the ions or atom together to form a crystal of
ionic compounds or molecule of covalent compounds”
Atom
is unstable due to incomplete octet or duplet. An atom may attain a stable
electronic arrangement by
· LOSING ELECTRONS [formation of cation]· GAINING ELECTRONS[formation of anion]· SHARING ELECTRONS[formation of molecule]
And
form ion or molecule which is stable due to complete octet or duplet. The
physical and chemical properties of an ion with respect to parent atom and
properties of a molecule with respect to constituent atoms are different.
TYPES OF CHEMICAL BONDS: Three
different types of the chemical bond may be formed on the basis of nature of the atom.
- Electrovalent
bond
– Metal and Non-Metal
- Covalent
bond – Non-metal and Non-metal
- Metallic bond – Metal and Metal
Some important electron dot structures
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