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प्रश्न
State why the atomic weight of an element is also termed relative atomic mass.
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उत्तर
- Atomic weight: Atomic weight is the mass of an atom, the number times it is heavier than an atom of hydrogen.
Since carbon atom is 12 times heavier than an atom of hydrogen. - Relative mass: Relative mass is equal to the number of times an atom of an element is heavier than 1/12 the mass of an atom of carbon.
Hence the atomic weight of an element is also termed relative atomic mass as it is in comparison with the mass of 1/12 the mass of a carbon atom.
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संबंधित प्रश्न
Multiple Choice Questions
The sub atomic particle with negative charge is
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(b) What is the relation between the atomic number and mass number of an element?
(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
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(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
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| 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 |
From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.
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The elementary particles such as protons and neutrons are collectively called ______.
‘Z’ is denoted by ______.
K and L shells can accommodate a maximum of 2 and 8 electrons respectively.
