To determine which group will pair with a Group 6 element in a 1:1 ratio based on trends in valence electrons, we need to understand the electron configuration and tendencies of these groups.
1. Group 6 Elements:
- These elements have 6 valence electrons.
- They tend to gain 2 more electrons to achieve a stable octet configuration, which is 8 valence electrons.
2. Potential Pairing Groups:
- Group 1:
- Elements in Group 1 have 1 valence electron.
- They tend to lose 1 electron to achieve a stable configuration, resulting in a +1 charge.
- To satisfy the requirement of Group 6 elements (gaining 2 electrons), we would need 2 atoms of Group 1 elements to provide a total of 2 electrons.
- Therefore, the ratio for Group 1 elements would be 2:1 (Group 1: Group 6).
- Group 7:
- Elements in Group 7 have 7 valence electrons.
- They tend to gain 1 electron to achieve a stable configuration of 8 valence electrons, resulting in a -1 charge.
- This would not pair well in a 1:1 ratio with Group 6 elements that need to gain 2 electrons.
- Group 5:
- Elements in Group 5 have 5 valence electrons.
- They tend to gain 3 electrons to achieve 8 valence electrons, which would not complement the 2-electron gain needed by Group 6 elements.
- Group 2:
- Elements in Group 2 have 2 valence electrons.
- They tend to lose 2 electrons to achieve a stable configuration, resulting in a +2 charge.
- This exactly complements the Group 6 elements which need to gain 2 electrons.
- Thus, the pairing ratio would be 1:1 (Group 2: Group 6).
From the analysis, the group that will pair with a Group 6 element in a 1:1 ratio is:
Group 2.
