Hello aspirant,

Every postulate is important, all atoms of a specific element are identical in mass, size, and other properties. However, atoms of different elements exhibit different properties and vary in mass and size. Furthermore, atoms cannot be divided into smaller particles.

All the postulates of Dalton's atomic theory are:

• The matter is made up of indivisible particles known as atoms.
• The properties of all the atoms of a given element are the same including mass. This can also be stated as all the atoms of an element have identical mass while the atoms of different elements have different masses.
• Atoms of different elements combine in a fixed ratio to form compounds.
• Atoms are neither created nor destroyed. This implies that during chemical reactions no atoms are created nor destroyed.
• The formation of new products results from the rearrangement of existing atoms.
• Atoms of an element are identical in mass, size, and many other chemical and physical properties but atoms of two different elements differ in mass, size, and many other chemicals or physical properties.

Thank you