1. What nuclide is formed when 90sr undergoes β decay?
When strontium-90 undergo
beta decay,
the decay equation is as follows
90 38sr → 9039y + 0-1e
the nuclide is yttrium-90 .
2. What is the daughter nucleus produced when 196pb undergoes
electron capture?
When lead-96 undergo an
electron capture , the nuclide formed is thallium-196
See the decay equation
19682pb + 0-1e → 19681tl
the nuclide formed is thallium-196
3. Calculate the percent activity of the radioactive isotope
strontium-89 remaining after 2 half-lives.
After two half lives the remaining
is
After the 1st half life we
50% will remain
after the second half life 25% of the original
sample will remain.
4. Calculate the percent activity of the radioactive isotope
rhenium-186 remaining after 2 half-lives
After two half lives the remaining
is
After the 1st half life we
50% will remain
after the second half life 25% of the original
sample will remain
25 % 0f the original sample
will remain
5. What is the daughter nucleus produced when 211pb undergoes
beta decay by emitting an electron
21182pb → 21181tl + 0-1e
from the decay equation , the remaining sample
is thallium-211.
6. "what is the daughter nucleus produced when 167 tm
undergoes electron capture"
When thulium-167 undergo
electron capture the resulting nuclide will be erbium-167, from the decay
equation we will get
16769tm + 0-1e → 16768er
7. A nuclide undergoes positron emission to form 22ne. What is
the nuclide
? → 0-1e
+ 2210ne
when neon-22 is formed from positron emission , the parent nuclide is
fluorine-22
22 11na → 0-1e + 2210ne
8. Bombarding 54fe with a neutron results in emission of a proton
and formation of
Answer this question
9. What nuclide is formed when 211po undergoes α decay?
21184po → 20782pb + 42he
the nuclide formed is lead-207
10. In the following equations, fill in the missing species.
A) ? + 0−1e → 7li
This is an electron capture,
the atomic of the parent nuclide will be 4, therefore
74bo + 0−1e → 7li
B) 9li → ? + 0 −1 e
This is a beta decay and the
nuclide will be boron-7
9li → 74bo + 0 −1 e
C) 22 11na → ? + 2210ne
When neon-22 is formed
from positron emission , the parent
nuclide is fluorine-22
22 11na → 0-1e + 2210ne
Attempt the following
questions using the comment box
11. Complete the nuclear equation 238 92u −→ ? + 234 90th .
12. Balance the nuclear equation 43 19k −→ 43 20 ca + ?
13. Write the nuclear equation for the release of an alpha particle
by 210 84 po
14. Identify the isotope that has atoms that contain 3 neutrons, 3
protons, and 3 electrons.
15. What is the name of an element with 3 protons and 5 neutrons
16. What can be altered in an atom without changing its identity
17. Does changing the number of neutrons affect the chemical
properties of that element
18. Complete the nuclear equation 253 99es + 4 2he −→ 1 0n + ? .
19. The following reaction represents what nuclear process? 21h +
21h ⟶
32he + 10n
20. 10 4be undergoes radioactive decay to form 10 5b. This is an
example ofs
21. 10 4be undergoes radioactive decay to form 10 5b. This is an
example of
22. Which answer shows a balanced nuclear equation for the beta
decay of potassium-42
23. Which answer shows a balanced nuclear equation for the alpha
decay of plutonium-239
24. Suspected of being used in 3400 bc
25. Starting with 100 carbon-14 atoms, how many would you expect to
have after one half-life?
26. You happen upon an antiques store and the clerk
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