Final answer:
E. Sulfur is a metalloid. In the list provided, all elements are correctly categorized according to the periodic table except for sulfur, which is a nonmetal and not a metalloid as stated.
Step-by-step explanation:
The element that is not classified correctly according to its position in the periodic table is E. Sulfur is a metalloid. In the periodic table, sulfur is classified as a nonmetal, not a metalloid. Metalloids are elements that have properties of both metals and nonmetals. Sulfur, on the other hand, is a nonmetal as it is located in Group 16, also known as the chalcogens.
The question is regarding the classification of elements used in fireworks and their proper grouping according to the periodic table. Taking a look at the options:
- Sodium is accurately classified as an alkali metal.
- Strontium is indeed an alkaline earth metal.
- Iron is correctly listed as a transition metal.
- Phosphorus is properly identified as a nonmetal.
- Sulfur however, is incorrectly classified as a metalloid; it is actually a nonmetal.
Therefore, the element not classified correctly according to its position in the periodic table is E. Sulfur, as it is a nonmetal, not a metalloid.