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प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
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उत्तर
2p3
Completing the electron configuration of the element as
1s2 2s2 2p3.
∴ Number of electrons present in the atom of the element = 2 + 2 + 3 = 7
∴ Atomic number of the element = 7
संबंधित प्रश्न
What are the two main features of Rutherford’s atomic model?
From the symbol `""_15^31"P"`, state : atomic number of phosphorus
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Phosphorus – \[\ce{^31_15P}\]
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| List I | List II |
| 1. Mass number of an atom is the number of protons and | A: Electron |
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| 3. An atom having stable electronic configuration. | C: Nitrogen |
| 4. A molecule formed by sharing of electrons [covalency] | D: Sodium |
| 5. A metallic atom having unstable electronic configuration. | E: Neutrons |
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| Atomic Number | Mass Number | Number of Neutrons | Number of Protons | Number of Electrons | Name of the Element |
| 9 | ______ | 10 | ______ | ______ | ______ |
| 16 | ______ | 16 | ______ | ______ | ______ |
| ______ | 24 | ______ | ______ | 12 | Magnesium |
| ______ | 2 | ______ | 1 | ______ | ______ |
| ______ | 1 | 0 | 1 | 1 | ______ |
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what is the atomic mass number? mention its formula.
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