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U2-LM2B-WS – FUNDAMENTAL PARTICLES OF ATOM 1. The smallest particle of an element is an __________________. electron 2. The three fundamental subatomic particles are: ___________, the ______________and electron proton the _____________. The two particles that have equal but opposite charge are_______and neutron proton the _____________. The particles that reside in the nucleus are called nucleons and consist electron of the ___________ and the ____________. Each of these nuclear particles has a mass of proton neutron about ______ amu. A nucleon is about 2000 times heavier than an electron and therefore, 1 the mass of the electron is negligible and the mass of an atom resides in its ____________. nucleus 3. The number of protons in the nucleus is referred to as the ______________. atomic number 4. The total number of particles in the nucleus is referred to as ___________________. atomic mass 5. An atom of indium, In, with a mass number of 113 has ____protons, ____ 49 49 electrons and _____ 64 neutrons. 6. An atom of iron, Fe, with a mass number of 56 has has _____protons, ____electrons and 26 26 _____ 30 neutrons. 7. The mass number is symbolized with the letter: ______ while the atomic number is ____. A Z 8. What are the name and the symbol of the element which has 33 protons, 42 neutrons and 33 electrons? ______________________ Arsenic-75, As-75 9. What are the name and the symbol of the element which has 80 protons, 80 electrons and 120 neutrons? ______________________ Mercury-200, Hg-200 10. Which is the element that has 24 protons? ____ No Cr Can you provide the nuclide symbol?___ 11. Provide the nuclide symbol for the neutral atom having 29 electrons and 34 neutrons. 63 Cu 29 12. If the mass of each nucleon is approximately 1 amu and the mass of an electron is negligible, then the mass of an atom of nickel-58 is approximately ________ amu and the 58 mass of a rubidium-87 atom is approximately ___________amu. 87