Which group in the periodic table contains only elements that can form anions in ionic compounds?

• A. Group 17 (halogens)
• B. Group 18 (noble gases)
• C. Group 1 (alkali metals)
• D. Group 2 (alkaline earth metals)

Answer: (A)

Verified step by step guidance

1. Understand that anions are negatively charged ions formed when atoms gain electrons.
2. Recall that elements in the periodic table tend to form ions based on their position and electron configuration.
3. Identify that Group 1 (alkali metals) and Group 2 (alkaline earth metals) typically lose electrons to form cations, not anions.
4. Recognize that Group 18 (noble gases) are generally inert and do not commonly form ions.
5. Know that Group 17 (halogens) have seven valence electrons and tend to gain one electron to form anions with a -1 charge in ionic compounds.