If three helium nuclei combine to form a carbon nucleus, energy is liberated. Why can't helium nuclei combine on their own and minimise the energy?

Helium nuclei combine to form an oxygen nucleus. The energy released in the reaction is if m_(O)=15.9994 "amu" and m_(He)=4.0026 "amu"

When two nuclei (with A=8) join to form a heavier nucleus , the binding energy (B.E) per nucleon of the heavier nuclei is

Hydrogen nucleus combines to form helium then energy is released. Binding energy/nucleon of He is greater than hydrogen.

If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is (Mass of the helium nucleus is 4.0026 amu and mass of oxygen nucleus is 15.9994 amu)

If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is (Mass of the helium nucleus is 4.0026 amu and mass of oxygen nucleus is 15.9994 amu)

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then :

When four hydrogen nuclei combine to form a helium nucleus in the interior of sun, the loss in mass is 0.0265 a.m.u. How much energy is released ?

A : Exothermic reactions are possible when two light nuclei fuse or when a heavy nucleus undergoes fission into intermediate mass nuclei. R: The nature of nuclear binding energy curve is such that it rises lighter nuclei and slightly decreasing for heavier nuclei.

Three prop -particles ( m_prop = 4.0026) amu are combined to form a C^12 nucleus. The energy released will be

If the nuclei of masess X and Y are fused together to form a nucleus of mass m and some energy is released, then