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311C F09 Worksheet_1+A - NAME_ANSWER KEY Discussion...

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NAME ____ ANSWER KEY ____________ BIO 311C Discussion Worksheet #1 The Chemical Context of Life 1. An atom consists of a nucleus and an outer part called the electron cloud. The nucleus contains_ 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. Draw the structure of the magnesium atom (atomic number 12 & mass number 24). 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.
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