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प्रश्न
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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उत्तर
\[\ce{_{Atomic number} ^4_2He ^{mass number}}\]
- Mass number – 4
- Atomic number – 2
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संबंधित प्रश्न
Explain the Mass number with example.
The composition of the nuclei of two atomic species X and Y are given as under
| X | Y | |
| Protons | 6 | 6 |
| Neutrons | 6 | 8 |
Give the mass numbers of X and Y. What is the relation between the two species?
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What is the (a) atomic number (b) number of protons in this element?
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The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
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A ______ number describes a specific aspect of an electron.
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