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प्रश्न
Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because
विकल्प
a lithium nucleus is more tightly bound than a carbon nucleus
carbon nucleus is an unstable particle
it is not energetically favourable
Coulomb repulsion does not allow the nuclei to come very close
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उत्तर
Coulomb repulsion does not allow the nuclei to come very close.
Lithium atom contains 3 protons and 3 neutrons in the nucleus and 3 valence electrons. When two lithium nuclei are brought together, they repel each other. The attractive nuclear forces being short-range are insignificant as compared to the electrostatic repulsion. Thus, the nuclei do not combine to form carbon atom because of coulomb repulsion.
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संबंधित प्रश्न
When a boron nucleus `(""_5^10"B")` is bombarded by a neutron, a α-particle is emitted. Which nucleus will be formed as a result?
The graph of ln `("R"/"R"_0)` versus ln A (R = radius of a nucleus and A = its mass number) is ______.
Fusion processes, like combining two deuterons to form a He nucleus are impossible at ordinary temperatures and pressure. The reasons for this can be traced to the fact ______.
- nuclear forces have short range.
- nuclei are positively charged.
- the original nuclei must be completely ionized before fusion can take place.
- the original nuclei must first break up before combining with each other.
Fusion processes, like combining two deuteron to from a He nucleus are impossible at ordinary temperatures and pressure. The reasons for this can be traced to the fact:
