Consider the following postulates of the atomic theory by John Dalton. Identify the correct ones. Atoms of various elements exhibit different natures. They do not have similar features. By combining in a ratio of the whole number, atoms form the compounds. Atoms are never destroyed nor created during any chemical reaction. ?

Option 4 : All 1, 2, 3

The correct answer is Option(4).i.e.All 1, 2, 3.  

• Atom: 
  • An atom is the smallest invisible unit of matter that constitutes a chemical element.
  • Every plasma, solid, gas & liquid, composed of ionized or neutral atoms.
  • Around 100 picometers across, atoms are extremely small. 
• Atomic theory: 
  • John Dalton invented atomic theory.
  • As per the theory, all matter whether it is a mixture, compound, element, is consists of invisible particles called ‘atoms’. 
• The postulates of the atomic theory: 
  • Atoms of various elements exhibit different natures. They do not have similar features.
  • Atoms of the same elements having similar natures & same characteristics.
  • By combining in a ratio of the whole number, atoms form the compounds.
  • Atoms are never destroyed nor created during any chemical reaction. 
  • Atoms are made of tiny invisible particles that cannot be divided.