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प्रश्न
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
विकल्प
A, B
B, C
C, A
A, B, and C
MCQ
उत्तर
B, C
Explanation:
B = 10 (2, 8), C = 5 (2, 3) Both have 2 periods.
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