Atom is cutable partical ,but atom subatomic particles election,proton and neutron परमाणु वियोज्य कण नहीं है, बल्कि परमाणु उपपरमाण्विक कण इलेक्ट्रॉन, प्रोटॉन और न्यूट्रॉन हैं An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element . Every solid , liquid , gas , and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers ( 1 × 10 −10 m , a ten-millionth of a millimeter, or 1/254,000,000 of an inch). They are so small that accurately predicting their behavior using classical physics – as if they were billiard balls , for example – is not possible. This is due to quantum effects . Current atomic models now use quant...