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प्रश्न
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
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उत्तर
Electronic configuration of element with atomic number 12 is:
K2 L8 M2
There will be 2 electrons in the K shell, 8 electrons in the L shell and 2 electrons in the M shell of its atom.
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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 | - |
What are the atomic numbers of elements whose outermost electrons is represented by 3s1.
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What is its atomic number and mass number?
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
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 |
Differentiate mass number from atomic number.
The atomic number and the mass number of an element is 26 and 56 respectively. Calculate the number of electrons, protons and neutrons in its atom. Draw the structure.
______ = No. of protons = No. of the electrons.
An element has 2 electrons in its N shell.
What is its atomic number?
