1. What is the change in atomic mass number when an atom emits an alpha particle?
A) decreases...
1. What is the change in atomic mass number when an atom emits an alpha particle?
A) decreases by 2
B) decreases by 4
C) decreases by 2
D) increases by 4
2. If an isotope decays by the process of beta emission __.
A) the mass number changes
B) the atomic number chnages
C) protons are given off
D) the number of neutrons remains the same
3. 56/25 Mn -> __ + 0/-1 e
A) 56/27 Co
B) 37/25 Mn
C) 56/26 Fe
D) 58/24 Cr
4. Which of the following naturally occurring radioisotopes would be most useful in dating objects though to be a million years old?
A) carbon-14; t1/2=5.73x10^3
B) potassium-40; t1/2=1.28x10^9
C) thorium-23; t1/2=25 days
D) radon-222; t1/2=3.8 days
5. The production of carbon-14 __.
A) takes place in the upper atmosphere
B) is mostly due to fallout from nuclear explosions
C) occurs to a large extent in nuclear reactors
D) is caused by photosynthesis in plants
Please help.. I will mark brainliest. Thanks!!
Answers: 3
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