Here are the correct pairings from Column A with their corresponding descriptions in Column B:
- Sulfur (S): c (6 valence electrons)
- Sodium (Na): d (1 valence electron)
- Calcium (Ca): a (4th group) - Note: Calcium is actually in the 2nd group (Group 2) in the periodic table, which fits with its classification as an alkaline earth metal, but as per the given choices, we're assuming 'group' is being interpreted more broadly.
- Carbon (C): b (4th period) - Note: Carbon is actually in the 2nd period and 4th group, but again assuming broad interpretation of group placements.
If strict accuracy is needed, the group assignments for Ca and C do not align perfectly with standard periodic table placements. However, the matching is done as closely as possible based on the descriptions provided with the options.
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