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Why do stable nuclei never have more pro...

Why do stable nuclei never have more protons than neutrons ?

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Because protons are positively charged and repel one another electrically . This repulsion becomes so great in nuclei with more than 10 protons or so that an excess of neutrons which produce only attractive forces is required for stability.
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NCERT EXEMPLAR ENGLISH-SEMICONDUCTOR ELECTRONICS: MATERIAL,DEVICES AND SIMPLE CIRCUIT-Multiplel choice questions
  1. In a nuclear reactor, moderators slow down the neutrons which come out...

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  2. Fusion processes, like combining two deuterons to form a He nucleus ar...

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  3. Sample of two radioactive nuclides A and B are taken. lambda(A) and la...

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  4. The variation of decay rate of two radioactive samples A and B with ti...

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  5. He(2)^(3) and He(1)^(3) nuclei have the same mass number. Do they have...

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  6. Draw a graph showing the variation of decay rate with number of active...

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  7. Which sample A or B shown in figure has shorter mean-life ?

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  8. Which one of the following cannot emit radiation and why ? Excited nuc...

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  9. In pair annihilation an electron and a positron destroy each other to ...

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  10. Why do stable nuclei never have more protons than neutrons ?

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  11. Consider a radioactive nucleus A which decays to a stable nucleus C th...

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  12. A piece of wood form the ruins of an ancient building was found to ha...

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  13. Are the nucleons fundamental particles or do they consist of still sma...

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  14. A nuclide 1 is said to be the mirror isobar of nuclide 2 if Z(1) =N(1)...

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  15. Sometimes a radioactive nucleus decays into a nucleus which itself is...

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  16. Deuteron is a bound state of a neutron and a proton with a binding ene...

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  17. The deuteron is bound by nuclear forces just as H-atom is made up of p...

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  18. Before the neutrino hypothesis the beta decay process was throught to ...

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  19. The activity R of and unknown radioactive nuclide is measured at hourl...

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  20. Nuclei with magic no. of proton Z=2,8,20,28,50,52 and magic no. of neu...

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