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practice_questions-solutions - CHEMISTRY FOR BIO 311C...

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CHEMISTRY FOR BIO 311C Practice Problems - Solutions www.utexas.edu/student/utlc/ 1) Compared to 31 P, the radioactive isotope 32 P has: One more neutron 2) The mass number of an element can be determined by adding: The number of protons and neutrons 3) When atoms gain or lose electrons, they are known as: Ions 4) The atomic number of an element is equal to the number of: The number of protons 5) Describe two isotopes of the carbon atom. Be sure to use the terms protons, neutrons, electrons, atomic number, atomic mass number, and atomic weight. C-13: it has 6 protons, 7 neutrons and 6 electrons, its atomic number = 6, atomic mass number is 13, and its atomic weight is ~ 13 daltons C-14: it has 6 protons, 8 neutrons and 6 electrons, its atomic number = 6, atomic mass number is 14, and its atomic weight is ~ 14 daltons 6) Use the Carbon atom and describe its shells (energy levels), orbitals and electrons. The carbon atom has two shells (energy levels). The first shell has 1 orbital which contains 2 electrons. The second shell has 4 orbitals (so there is room for 8 electrons). However, there are only 4 electrons in the second shell. 7)
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This note was uploaded on 09/01/2009 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas.

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practice_questions-solutions - CHEMISTRY FOR BIO 311C...

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