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प्रश्न
Write name of elements, symbol, atomic number, electronic configuration of second period in modern periodic table?
उत्तर
| Element | Symbol | Atomic number | Electronic configuration |
| Lithium | Li | 3 | 2, 1 |
| Beryllium | Be | 4 | 2, 2 |
| Boron | B | 5 | 2, 3 |
| Carbon | C | 6 | 2, 4 |
| Nitrogen | N | 7 | 2, 5 |
| Oxygen | O | 8 | 2, 6 |
| Fluorine | F | 9 | 2, 7 |
| Neon | Ne | 10 | 2, 8 |
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| Column A | Column B |
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| 3) d -block | c) Group 1, 2 |
| 4) f -block | d) Group 13 to 18 |
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