This video is about:
1. What is molecule
2. Difference between atom and molecule
3. Type of Molecule
4. Atomicity of an atom in Molecule and Compound

What is molecule :
A molecule is a group of two or more atoms held together by chemical bonds. It is the smallest unit of a compound that retains the chemical properties of that compound.

Difference between atom and molecule:
The main difference between an atom and a molecule is that an atom is the basic unit of matter, consisting of a nucleus (containing protons and neutrons) and orbiting electrons. On the other hand, a molecule is formed when two or more atoms combine together chemically.

Type of Molecule:
There are different types of molecules based on their structure and composition. Some commonly known types include:
Diatomic Molecules: These are molecules consisting of two atoms of the same or different elements bonded together. Examples include oxygen (O2) and hydrogen chloride (HCl).
Polyatomic Molecules: These are molecules containing more than two atoms bonded together. Examples include water (H2O) and carbon dioxide (CO2).
Organic Molecules: These are molecules containing carbon atoms bonded together with other elements such as hydrogen, oxygen, nitrogen, etc. Examples include glucose (C6H12O6) and amino acids.

Atom/Molecule/Compound
The atomicity of an atom refers to the number of atoms present in a molecule. It is different for different types of molecules. For example:
Diatomic molecules have an atomicity of 2 as they consist of two atoms bonded together.
Polyatomic molecules can have varying atomicity depending on the number of atoms bonded together.
Compounds are made up of different elements and can have varying atomicity based on their chemical formula. The atomicity of a compound is determined by the ratio of atoms present in its formula. For example, water (H2O) has an atomicity of 3 (2 hydrogens and 1 oxygen).

Note: The atomicity of a compound is always represented by whole numbers and is not limited to the examples provided above.

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