Which group of elements in the periodic table tends to form 1+ ions?

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

Answer: (D)

Verified step by step guidance

1. Identify the groups mentioned and their typical ion charges: Group 18 (noble gases) are generally inert and do not form ions under normal conditions.
2. Group 17 (halogens) tend to gain one electron to form 1- ions because they have seven valence electrons and need one more to complete their octet.
3. Group 2 (alkaline earth metals) typically lose two electrons to form 2+ ions since they have two valence electrons.
4. Group 1 (alkali metals) have one valence electron, which they tend to lose easily to achieve a stable electron configuration, forming 1+ ions.
5. Therefore, the group that tends to form 1+ ions is Group 1 (alkali metals) because they lose one electron to form a cation with a +1 charge.