allerySodium (atomic number 11) belongs to which group and period?
AGroup 11, period 4
BGroup 2, period 3
CGroup 1, period 2
DGroup 1, period 3
Answer & Solution
Correct answer: D. Group 1, period 3
1. Sodium has electronic configuration 2, 8, 1.
2. Three electron shells place it in period 3.
3. One valence electron places it in Group 1.
4. So sodium is in Group 1, period 3.
5. Sodium is the second alkali metal after lithium.
_Source: syllabus Science Ch 5 'Periodic Classification of Elements'_
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