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Answer» <html><body><p><em><u>The atomic nucleus is the small, dense region <a href="https://interviewquestions.tuteehub.com/tag/consisting-930072" style="font-weight:bold;" target="_blank" title="Click to know more about CONSISTING">CONSISTING</a> of protons and neutrons at the <a href="https://interviewquestions.tuteehub.com/tag/center-11455" style="font-weight:bold;" target="_blank" title="Click to know more about CENTER">CENTER</a> of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment. After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg.An atom is composed of a positively-charged nucleus, with a cloud of negatively-charged electrons surrounding it, bound together by <a href="https://interviewquestions.tuteehub.com/tag/electrostatic-2069468" style="font-weight:bold;" target="_blank" title="Click to know more about ELECTROSTATIC">ELECTROSTATIC</a> force. Almost all of the mass of an atom is <a href="https://interviewquestions.tuteehub.com/tag/located-543617" style="font-weight:bold;" target="_blank" title="Click to know more about LOCATED">LOCATED</a> in the nucleus, with a very small <a href="https://interviewquestions.tuteehub.com/tag/contribution-932552" style="font-weight:bold;" target="_blank" title="Click to know more about CONTRIBUTION">CONTRIBUTION</a> from the electron cloud. Protons and neutrons are bound together to form a nucleus by the nuclear force.</u></em></p></body></html>


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