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As the air warms, different elements change from a liquid back to a gas.The portion of air that changes back to a gas at -185.86°C (-302.55°F) is argon. Curie · Skłodowska-Curie · Davisson · Fermi · Hahn · Jensen · Lawrence · Mayer · Meitner · Oliphant · Oppenheimer · Proca · Purcell · Rabi · Rutherford · Soddy · Strassmann · Szilárd · Teller · Thomson · Walton · Wigner The three naturally-occurring isotopes of hydrogen.

Questo decadimento è accompagnato con l'emissione di particelle come elettroni (conosciuti anche come particelle beta) e particelle alfa.For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively. From left to right, the isotopes are protium ( Isotopes are variants of a particular chemical element which differ in neutron number. The fact that each isotope has one proton makes them all variants of hydrogen: the identity of the isotope is given by the number of neutrons.

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