Have you found videos, websites, or explanations that helped you understand this chapter? Let us know and we'll add them to "Resources" part of this page for other students to use.
Typically the number of neutrons is the same as the number of protons with the exception of isotopes.
But this is an isotope so take the mass number and subtract the protons from it.
67-30 = 37
Take the charge into account (2+)
So that means there are two less electrons than there should be so 30-2=28
Atomic number is the same as the proton number
Which of the following statements is INCORRECT regarding nuclear reactions?
The positively charged protons in the nucleus are held together by the strong force made possible by the presence of neutrons. Based on the graph in the supplement, which of the following statements are correct?
Predict the mode of decay and the product for 32Si. (You need your periodic table for this and the following questions.)
237Np ------> 7 4He + 209Bi + 4 0e
93 2 83 -1
130I decays by emission of beta particles to form stable 130Xe. A 3.00 g iodine sample containing some I-130 was recorded as having 1829 disintegrations per min. k = 0.00094 min -1. How many radioactive I-130 atoms are present in the sample?
Hint, just use R = kN and solve for N.
1829 = 0.00094(N)
The radioactive decay of a sample containing an unknown radioactive isotope produced 8898 disintegrations per minute. 10.17 days later, the rate of decay was found to be 2898 disintegrations per minute. Calculate the half-life in days for the unknown radioactive isotope.
ln (Rt/Ro) = -kt
R0=8898d/min * 1440 min/day = 12813120
ln (3303720/12813120) = -k(10.17)
t1/2 = 0.693/k = 6.28
Your content goes here...
The half-life of carbon-14 is 5,730 years. An artifact produces 13.9 disintegrations of 14C per minute per gram of carbon in the sample. Estimate the age of this sample assuming that its original radioactivity was 15.3 disintegrations per minute per gram of carbon.
t1/2 = 0.693/k=5730
What is the energy released when 0.771 g are converted to energy? Express your answer in joules. For self-consistent units you must use kg because 1 J = 1 kg m2/s2.
# of neutrons =14
# of protons =13
14*1.008665 - 14.12
mass defect = 27.223 - 26.9815
What is the nuclear binding energy per mole if the mass defect of a certain isotope is 0.0800 u per atom or 0.0800 g per mol? Express your answer in joules. Remember to use self-consistent units.
=(0.0800g/mol * 1kg/1000g) * (3e8)^2=7.2e12