311C F08 Worksheet_1 - NAME Discussion Worksheet#1 The...

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NAME _________________________ BIO 311C F08 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 ______________ and ______________. 2. Fill in the charge for each type of subatomic particle: a. Proton ____________ b. Neutron ___________ c. Electron ___________ 3. The atomic number of an element indicates the number of ____________ in the nucleus of the atom, and also tells us the number of ___________ 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 _____________ and ___________ of an atom. Thus, you can determine the number of _________ by subtracting the atomic number from the mass number. 5. Draw the structure of a 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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