An unknown radioactive isotope. Through a nuclear reaction, 2 alpha-particles and 1 beta-particle are released and converted to the -C-14 isotope. The actual mass of the helium nucleus is 4.00389amu. .The mass of a proton and a neutron is 1.007825amu and 1.008665amu respectively. What is the mass of the unknown isotope
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Explanation:
the mass of the unknown isotope is 20.16574