Which group of elements on the periodic table is considered the least reactive due to their high metallic character?

• A. Halogens (Group 17)
• B. Alkali metals (Group 1)
• C. Noble gases (Group 18)
• D. Transition metals (Groups 3-12)

Answer: (C)

Verified step by step guidance

1. Understand the concept of reactivity in relation to metallic character: Metals tend to lose electrons and form positive ions, while nonmetals tend to gain electrons. The reactivity depends on how easily an element can lose or gain electrons.
2. Recall the position of the groups on the periodic table: Group 1 contains alkali metals, Group 17 contains halogens, Group 18 contains noble gases, and Groups 3-12 contain transition metals.
3. Recognize that alkali metals (Group 1) are highly reactive metals because they have one valence electron that they readily lose.
4. Know that halogens (Group 17) are highly reactive nonmetals because they need only one electron to complete their valence shell.
5. Identify that noble gases (Group 18) have a full valence shell, making them very stable and the least reactive group due to their low tendency to gain or lose electrons.