As per Ancient philosophy,

Atoms are smallest units of matter that cannot be divided into smaller and smaller components


When we divide matter smaller and smaller components 

we reach a stage when no more division is possible


These particles are called atoms.


In India,

Maharshi Kanad also proposed a similar philosophy


If we go on dividing padarth (matter) into smaller and smaller component

a stage will come when particles cannot be divided any further


These particles are called parmanu (atoms)


Modern Theory

Modern theory was developed by scientists at the end of the 18th century. This theory was based on experiments (and not philosophy)


As per this theory,

There was a difference between elements and compounds

These different elements combined with each other following the laws of chemical combination.


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Elementary and Compound based on modern theory-Teachoo-01.jpg

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo