What is the general rule for the ratio protons to neutrons for stable isotopes h

Question

What is the general rule for the ratio protons to neutrons for stable isotopes having an atomic number less than 20? Between 20 and 40? Between 40 and 80? Above 80? The following nuclei do not lie in the band of stability. How would they be expected to decay? And what the expected daughter nuclide is? (a)^22_15P (d)^92_235U (c)^37_20 Ca (d)^9_3 Li (e)^245_98 Cm If a sample of Co-60 initially disintegrates at a rate of 4.3 times 10^6 dps and after 21.2 years the rate has dropped to 2.6 times 10^5 dps, what is its half life? The energy yield of a nuclear weapon is measured in Mt (megatons of TNT). If the explosion of 1 ton of TNT yield 4.2 GJ(giga joules) of energy, how much mass (in kg) of matter was converted to energy in the 57 Mt blast of the weapon ever tested?

Explanation / Answer

Q7

a) ratio when Z < 20, is 1:1

b) ratio between 20 < Z < 40 is 1.51 to 1

c) ratio between 40 < Z < 80 is 1.51 to 1

d) ratio for Z > 80 must follow the "belt/band of stability"

how would they expect to decay

28 15 P = beta positive decay

235 92 U = alpha decay

37 20 Ca= beta positive decay

9 3 Li = beta negative decay

245 96 U = alpha decay

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