Why is it impossible for the isotope 2/2 He to exist. Define nuclear binding ene

Question

Why is it impossible for the isotope 2/2 He to exist. Define nuclear binding energy. mass nucleon defect and nucleon How does Einstein's equation, E = mc^2 to calculate nuclear binding energy? Why is it preferable to use nuclear binding energy per nucleon for a comparison of the stabilities of different nuclei? The radius of a uranium-235 nucleus is about 7.0 times 10^-3 pm. Calculate the density of the nucleus in g/cm^3. (Assume the atomic mass is 235 amu.) For each pair of isotopes listed, predict which one is less stable: (a) 6 3Li or 9 3Li. (b) 23 11Na or 25 11Na. (c) 48 20Ca or 48 21 Sc For each pair of elements listed, predict which one has more stable isotopes: (a) Co or Ni, (b) F or Se. (c) Ag or Cd. In each pair of isotopes shown, indicate which one you would expect to be radioactive: (a) 20 10 Ne and 17 10Ne. (b) 40 20Ca and 45 20Ca, (c) 95 42 Mo and 93 43 Tc, (d) m and 196 80 He. (e) 209 83 Bi and 242 96 Cm. Given that H(g) + H(g) rightarrow H_1 (g) Delta H degree = -436.4 kJ/mol calculate the change in mass (in kg) per mole of H_2 formed. Estimates show that the total energy output of the sun is 5 times 10^26 J/s. What is the corresponding loss in kg/s of the sun?

Explanation / Answer

Among the given pairs,

Ne-17, Ca-45, Tc-92, Hg-195, and Cm-242 are radioactive elements.

Genarally radioactive nature of elements can be predicted by their nuclear constituents, viz. neutrons and protons.

If n/p ratio for lower elements is approches 1 for stable atoms and it is upto 1.2 for higher atomic elements.

for example,

n/p of Ne-17 is 0.7 (<1) unstable.

n/p of Ca-45 is 1.25 (>1) unstable.

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