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Atoms cannot exist independently.
So in order to exist stably in nature, they combine to form molecules.
What is a Molecule?
A group of atoms chemically bonded together is called Molecule.
What are Different Types of Molecules?
Molecules are of 2 types
- Molecule of Single Element
- Molecule of Compound
Molecules of Single Element
They contain 2 or more atoms of the same type chemically bound together
Examples
- Oxygen molecule O 2 has 2 atoms of oxygen ato
- Ozone molecule O 3 has 3 atoms of oxygen atom
What is a Molecule?
A group of atoms chemically bonded together is called Molecule.
What are Different Types of Molecules?
Molecules are of 2 types
- Molecule of Single Element
-
Molecule of Compound
Molecules of Single Element
They contain 2 or more atoms of the same type chemically bound together
Examples
- Oxygen molecule O2 has 2 atoms of oxygen atom
- Ozone molecule O3 has 3 atoms of oxygen atom
What is a Molecule?
A group of atoms chemically bonded together is called Molecule.
What is atomicity?
Number of atoms in a molecule of element is called atomicity
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Some atoms are Monoatomic
They have 1 atom which exists independently
Example-Argon (Ar), Helium (He)
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Some atoms are Diatomic
They have 2 atoms chemically combined together
Example - Oxygen (O2 ), Hydrogen(H2), Nitrogen(N2), Chlorine(Cl2)
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Some atoms are Tetra-atomic
They have 4 atoms chemically combined together
Example-Phosphorus(P4)
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Some atoms are Polyatomic
They have many atoms chemically combined together
Example- Sulphur(S8) has 8 atoms chemically combined together
What is a Molecule?
A group of atoms chemically bonded together is called Molecule.
Molecules of Compounds
Some compounds contain more than 1 type of element.
These elements are combined in fixed proportion.
Example
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H
2
O - It contains 2 atoms of Hydrogen chemically combined with 1 atom of Oxygen.
- CO 2 - It contains 1 atom of Carbon combined with 2 atoms of Oxygen
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