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प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
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उत्तर
3p5
Completing the electron configuration of the element as
1s2 2s2 2p6 3s2 3p5
∴ Number of electrons present in the atom of the element = 2 + 2 + 6 + 2 + 5 = 17
∴ Atomic number of the element = 17
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संबंधित प्रश्न
Explain the Atomic number with example.
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| X | Y | |
| Protons | 6 | 6 |
| Neutrons | 6 | 8 |
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Fill in the blank
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Tick the most appropriate answer.
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- elements
- isotopes
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The total number of protons and neutrons in the nucleus of an atom is called its _________.
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Element with 6 valence electrons
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Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
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(2) a metal,
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Complete the following table.
| 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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The No. of electrons in the outermost shell of the atom of an inert gas ______.
The elementary particles such as protons and neutrons are collectively called ______.
‘A’ is denoted by ______.
If M is the atomic mass and A is the mass number, then packing fraction is given by ______.
State the term for the following:
The amount of substance which contains the same number of units as the number of atoms in carbon-12.
