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Atomic number Atomic number  Definition :-  Atomic number is the number of protons in nucleus. eg. Helium About  explanation of the superscripts and subscripts seen in atomic number notation. Atomic number is the number of protons, and therefore also the total positive charge, in the atomic nucleus. The  Rutherford–Bohr model  of the  hydrogen atom  ( Z  = 1 ) or a hydrogen-like ion ( Z  > 1 ). In this model it is an essential feature that the photon energy (or frequency) of the electromagnetic radiation emitted (shown) when an electron jumps from one orbital to another be proportional to the mathematical square of atomic charge ( Z 2 ). Experimental measurement by  Henry Moseley  of this radi

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  quantum principles  to better explain and predict this behavior.