Which nuclear equations is properly balanced? Uranium-234 undergoes spontaneous

Question

Which nuclear equations is properly balanced? Uranium-234 undergoes spontaneous radioactive decay to give an alpha particle and a new nucleus, X. What is x? _90^230Th _90^230U _94^238U _94^238Pu In the nuclear reaction what is X? proton neutron deuteron electrons positron If it takes 5.0 years for^60Co to lose one-half of its radioactivity, what percentage of its original activity will remain at the end of 20 years? 0% 6.25% 12.5% 25.0% In the nuclear reactions the element Z that is formed is _90^239Z _90^240Z _90^238Z _93^239Z _94^239Z A sample of a radioactive isotope initially contains 20 times 10^10 atoms. After 16 days, 5 times 10^10 atoms remain. What is the half-life of the isotope? 4days 8days 12days 16days A contain radioactive isotope has a half size of 10mins. If we have 20 mu g of this isotope at one instant, have many micro protons will remain at the end of 20 minutes? 0 2.5 5 10 20 beta nucleus may lead to increased nuclear visibility by decreasing the hp radio. Increasing the mass number. decreasing the mass number. decreasing the atomic number. which particle, if local from the nuclear, will result is no change in the atomic number? proton newton alpha particle beta particle non of these Rank the 3 types of radioactivity from leave to mass pending. alpha

Explanation / Answer

9)
A)
It is not balanced as sum of atomic number is 6 on recatant and 7 on product side
B)
It is balanced
C)
It is not balanced as sum of atomic number is 14 on recatant and 15 on product side
D)
It is not balanced as sum of atomic number is 6 on recatant and 8 on product side

Answer: B

10)
atomic number of X = 234-4=230
mass number of X = 92-2 = 90
Answer: A

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