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Question 4.2: Use the periodic table to classify each of the following ele......

Use the periodic table to classify each of the following elements by its group and period, group name (if any), and as a metal, a nonmetal, or a metalloid:
a.  Na, important in nerve impulses, regulates blood pressure
b.  I, needed to produce thyroid hormones
c.  Si, needed for tendons and ligaments

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a.  Na (sodium), Group 1A (1), Period 3, is an alkali metal.
b.  I (iodine), Group 7A (17), Period 5, halogen, is a nonmetal.
c.  Si (silicon), Group 4A (14), Period 3, is a metalloid.

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