To start this question, we should know what is the atomic number of cobalt. The atomic number (the number of protons) of Cobalt is Z =27.
Now, we know that a Cobalt 60 isotope means an isotope of Cobalt whose Atomic Mass is 60.
Thus, in a Cobalt 60 isotope, the number of neutrons in the nucleus are

From the question we know that the given nuclear mass is 59.933820 u.
Now, the mass defect of Cobalt 60 can be easily calculated by adding the masses of the protons and the neutrons as per our calculations and subtracting the given nuclear mass from it.
Thus,
Mass Defect = (Number of Protons Mass of Proton given in the question) + (Number of Neutrons Mass of Neutron given in the question)-59.933820 u

Thus, the required Mass Defect is 0.5634u.
In eV, the Mass Defect is 
Answer: She bought 68 books.
Step-by-step explanation:
Subtract 31 from 99 to find the difference! The difference tells us how many books she bought at the yard sale.
Answer:
Second option
Step-by-step explanation:
They have two congruent pairs of sides and one congruent pair of angles.
Answer:
f $270= the remaining 24% then you want to do 270/24=11.25 Then you want to multiply that by 76 and you will get $855
So $270+$855=24%+76% So his monthly salary was $1,125
If you are still confused do it in reverse! 1,125/100=11.25
11.25•24=270 & 11.25•76=855
270+855=1,125
Step-by-step explanation:
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