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Name ___________________________________ Atoms Matching _____1. Proton A. atoms of the same element with different number of neutrons _____2. Neutron B. neutral particle with NO charge in the nucleus of the atom _____3. Electron C. contains 99.9% of mass of the atom; center of an atom _____4. Nucleus D. negatively charged particle in electron shells of atom _____5. Isotopes E. positively charged particle in the nucleus of the atom Choose the best answer. ______6. The nucleus of the atom contains__________. A. protons and electrons B. electrons and neutrons C. protons and neutrons D. electrons only _____7. Which particles have the same size and mass of each other? A. protons and electrons B. electrons and neutrons C. protons and neutrons D. None- each is different in size and mass ______8. Which two particles would be attracted to each other? A. protons and electrons B. electrons and neutrons C. protons and neutrons D. None of them ______9. The atomic number of an element is the same as the number of __________that it has: A. protons B. neutrons C. mass of protons and neutrons D. mass of electrons ______10. What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common? A. They each identified new elements. B. They each identified new isotopes of atoms. C. They each contributed to the development of the atomic theory. D. They each conducted experiments in which particles collided ______11. An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of A. 39 B. 197 C. 158 D. 276 ______12. How many protons does an atom with an atomic number of 10 and a mass number of 20.1797 have? A. 10 B. 31 C. 11 D. 30 ______13. Isotopes exist because atoms of the same element can have different numbers of A. protons B. electrons C. neutrons D. None of the above ______14. The Greek philosopher who gave the atom its name was A. Democritus B. Dalton C. Thomson D. Rutherford ______15. A representation of an object or system is a(n) A. theory B. law C. model D. experiment ______16. The S.I. unit used to express the masses of particles in atoms is the A. kilogram (kg) B. Newton (N) C. gram (g) D. atomic mass unit (amu) ______17. The least massive particles of an atom are A. protons B. electrons C. neutrons D. Both (a) and (b) ______18. An atom becomes an ion when A. there are equal numbers of protons and electrons. B. there are equal numbers of protons, neutrons, and electrons. C. there are unequal numbers of protons and electrons. D. None of the above ______19. Protons push away from one another in the nucleus because of ___________. A. gravitational force B. strong force C. electromagnet force D. weak force Complete the blank for the element below. 16 S 32.06 20. Atomic number________ 21. Atomic mass__________ 22. # of protons___________ 23. # of neutrons__________ 24. # of electrons__________ What is the name of the element in the drawing above? ________