Question

What are atoms ? How big are atoms ? How do atoms Occur ?

Answer 1

1. According to Dalton an atom is something that cannot be divided further.
2. This is the ultimate particle of an element that maintains its chemical identity throughout all chemical and physical changes.
3. Thus, the atoms are the building blocks of all matter.
4. The atoms are very small.
5. In fact they are smaller than anything we can imagine or compare with.
6. The atom size is expressed as atomic radius. Atomic Radius is generally measured in Nanometers $1\mathrm{nm}={10}^{-9}\mathrm{m}$
7. An Element is a pure substance that is made up of only one kind of atoms.