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1. Table 2.1 lists the chemical elements that occur naturally in the human body. Similar percentages of these elements are found in most living organisms. a. In what abiotic (nonlife) b. In what chemical chemical form(s) are form(s) do animals need these elements often to obtain these ele found in nature? ments? c. In what chemical form(s) do plants need to obtain these elements? 2. A chemical element cannot be broken down to other forms by chemical reactions. Each element has a specific number of protons, neutrons, and electrons. a. What is the name of the following element, and how many protons, neutrons, and electrons does it have? 11 Na 23 Name Number of protons Number ofneutrons Number of electrons I b. What information do you need to calculate or determine the following? The atomic number of an element The mass number of an element The weight in daltons of one atom of an element