The correct statement among the options is:
1. As is a metalloid and Se is a nonmetal.
2. Cu is a transition element and Ge is a metalloid.
3. Both F and I are halogens.
Therefore, the correct answer is "1, 2, and 3".
Let's break down each statement to understand why they are true:
1. As is a metalloid and Se is a nonmetal:
Metalloids are elements that have properties of both metals and nonmetals. As (arsenic) is commonly classified as a metalloid. Se (selenium), on the other hand, is a nonmetal.
2. Cu is a transition element and Ge is a metalloid:
Transition elements are located in the d-block of the periodic table and have partially filled d orbitals. Cu (copper) is a transition element. Ge (germanium), on the other hand, is classified as a metalloid due to its properties.
3. Both F and I are halogens:
Halogens are a group of elements located in Group 17 of the periodic table. They are highly reactive nonmetals. F (fluorine) and I (iodine) both belong to this group and exhibit typical halogen characteristics.
To summarize, all three statements are correct. As is a metalloid, Se is a nonmetal, Cu is a transition element, Ge is a metalloid, and F and I are both halogens.