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Question
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.
Very Short Answer
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Solution
| Element | Atomic number |
Electronic configuration |
Valency |
| Beryllium (Be) | 4 | 2, 2 | 2 |
| Oxygen (O) | 8 | 2, 6 | 2 |
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