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प्रश्न
The atomic number of beryllium is 4 while that of oxygen is 8. Write down the electronic configuration of the two and deduce their valency from the same.
अति संक्षिप्त उत्तर
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उत्तर
| Element | Atomic number |
Electronic configuration |
Valency |
| Beryllium (Be) | 4 | 2, 2 | 2 |
| Oxygen (O) | 8 | 2, 6 | 2 |
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