An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (1)
Alkali metals are metals.
Halogens are nonmetals.
Noble gases are unreactive.
Explanation
Understanding the Problem We need to match the groups alkali metals, halogens, and noble gases to their characteristic properties using the periodic table.
Identifying Alkali Metals Alkali metals are in Group 1 (except for Hydrogen). They are known to be highly reactive metals.
Identifying Halogens Halogens are in Group 17. They are highly reactive nonmetals.
Identifying Noble Gases Noble gases are in Group 18. They are generally unreactive gases.
Matching Groups to Properties Therefore:
Alkali metals match with 'metal'
Halogens match with 'nonmetal'
Noble gases match with 'unknown' (referring to their unreactive nature)
Examples
Understanding the properties of elements in the periodic table is crucial in chemistry. For example, knowing that alkali metals are highly reactive helps in safely storing and handling them in labs. Similarly, the inertness of noble gases makes them suitable for applications like lighting (neon lights) and protecting sensitive materials from oxidation. Halogens, due to their high reactivity, are used in disinfectants and sanitizers. This knowledge is fundamental in various fields, including medicine, materials science, and environmental science.
