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प्रश्न
Fill in the following blanks in respect of an atom of an element :
| Number of protons | Number of neutrons | Mass number | Atomic number | Number of electron | Valency |
| 11 | 12 | _________ | _________ | _________ | _________ |
रिक्त स्थान भरें
उत्तर
| No. of protons | No. of neutrons | Mass no. | Atomic no. | No. of electrons | Valency |
| 11 | 12 | 23 | 11 | 11 | 1 |
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