Worksheet 1 Key - NAME _ANSWER KEY_ Part 1. The Chemical...

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NAME ____ ANSWER KEY ____________ BIO 311C Part 1. The Chemical Context of Life 1. An atom consists of an inner part, or nucleus, and an outer part called the electron cloud. The nucleus is made up of _ PROTONS __ and ___ NEUTRONS ___. 2. Fill in the charge for each type of subatomic particle: a. Proton __ +1 __ b. Neutron ___ 0 ___ c. Electron ___ -1 ___ 3. The atomic number of an element indicates the number of __ PROTONS __ in the nucleus of the atom, and also tells us the number of _ ELECTRONS _ outside the nucleus. This number is unique for each element. 4. The mass number of an element can vary. This number is the sum of the __ PROTONS _ and _ NEUTRONS _ of an atom. Thus, you can determine the number of _ NEUTRONS _ by subtracting the atomic number from the mass number. 5. 6. Isotopes of an element differ in the number of neutrons found in the nucleus. (A) One isotope of chlorine has 17 protons and 18 neutrons, (B) while another has 17 protons and 20 neutrons. For both isotopes fill in the atomic number, mass number, and number of electrons outside the nucleus. Isotope # protons # neutrons Atomic # Mass # # electrons (A) 17 18 17 35 17 (B) 17 20 17 37 17 7. Electrons flying around the nucleus of an atom are found in different energy levels or electron shells. The first shell, closest to the nucleus can hold up to _ 2 _ electrons. The second electron shell can hold up to _
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This note was uploaded on 05/01/2008 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas at Austin.

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Worksheet 1 Key - NAME _ANSWER KEY_ Part 1. The Chemical...

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