Answer:
Present in all matter
Explanation:
John Dalton was the first scientist to propose the 'theory of atom'. The crucial ideas of Dalton's theory were:
- All matter is composed of atoms
- Atoms are indivisible
- Different atoms combine to form molecules
- Atoms of the same element have identical mass, size and properties
Thus, based on the given options the statement that best describes an atom from the perspective of Dalton's theory is that they are present in all matter
