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An atom is the smallest constituent unit of ordinary matter


Atom (A very small particle)

Requires understanding of particle concept.

Development of this idea - ancient Greece. Scientist/Democritus - thought experiment lead to idea of matter being ultimately made of atoms after the atomos meaning undivisible.

Atom (The smallest unit of a chemical substance)

Development of this idea - Scientist/John Dalton - proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.


Atoms fully occupy space