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प्रश्न
Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
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उत्तर
11Na -2,8,1 (11 electrons)
Na – 1e–—> Na+ (10 electrons) Electronic configuration 2, 8.
The atomic number of an element is equal to the number of protons in its atom. Since, sodium atom and sodium ion contain the same number of protons, therefore, the atomic number of both is 11.
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संबंधित प्रश्न
If number of electrons in an atom is 8 and number of protons is also 8, then
- What is the atomic number of the atom? and
- What is the charge on the atom?
Explain the Atomic number with example.
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
Give the following a suitable word/phrase.
Atoms of same element with same atomic number but a different mass number.
The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement.
The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
From the symbol `""_15^31"P"`, state : atomic number of phosphorus
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. Mass number of an atom is the number of protons and | A: Electron |
| 2. The sub-atomic particle with a negligible mass. | B: Argon |
| 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 |
What is atomic number?
What is mass number of an atom?
