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प्रश्न
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
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उत्तर
Atomic number 8
Electronic configuration (8): 2,6
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संबंधित प्रश्न
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 | - |
Dalton said that ______ could not be divided.
What are the two main features of Rutherford’s atomic model?
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
What is the significance of atomic numbers in the modern Periodic Table?
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 |
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Sodium [At. no. = 11, Mass no. = 23]
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
What is the relation between mass number & atomic number?
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.
