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प्रश्न
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 |
उत्तर
| List I | List II |
| 1. Mass number of an atom is the number of protons and | E: Neutrons |
| 2. The sub-atomic particle with a negligible mass. | A: Electron |
| 3. An atom having stable electronic configuration. | B: Argon |
| 4. A molecule formed by sharing of electrons [covalency] | C: Nitrogen |
| 5. A metallic atom having unstable electronic configuration. | D: Sodium |
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संबंधित प्रश्न
Fill in the blank
An ion which has a positive charge is called a ..................
Write true or false for the following statement
An atom on the whole has a positive charge.
What are the two main features of Rutherford’s atomic model?
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
The atomic number of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is :
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Phosphorus – \[\ce{^31_15P}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Carbon [At. no. = 6, Mass no. = 12]
Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one:
- forms anion – negative ion;
- forms cation – positive ion;
- has 4 electrons in the outermost orbit. [Y, Z, X]
What is a neutron?
______ = No. of protons = No. of the electrons.
