An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (1)
Identify halogens as elements in Group 17 of the periodic table.
Locate the given elements (sulfur, calcium, argon, and bromine) on the periodic table.
Determine that bromine (Br) is the only element in Group 17.
Conclude that bromine is the halogen. B r
Explanation
Identifying Halogens We need to identify which of the given elements is a halogen. Halogens are in Group 17 (also known as Group VIIA) of the periodic table. The elements provided are sulfur (S), calcium (Ca), argon (Ar), and bromine (Br).
Locating Elements Let's locate each element on the periodic table:
Sulfur (S) is in Group 16.
Calcium (Ca) is in Group 2.
Argon (Ar) is in Group 18.
Bromine (Br) is in Group 17.
Determining the Halogen Since bromine (Br) is in Group 17, it is a halogen.
Examples
Halogens are used in many everyday applications, such as disinfecting swimming pools (chlorine), in lighting (iodine), and in non-stick cookware (fluorine). Identifying halogens is crucial in understanding chemical reactions and their applications in various industries. For example, in organic chemistry, halogens are often used as substituents in molecules to modify their properties.
