14. Plutonium-242 is radioactive and unstable. Which reaction correctly represen
ID: 1463999 • Letter: 1
Question
14. Plutonium-242 is radioactive and unstable. Which reaction correctly represents the decay of this isotope?
a. 242Pu 1n + 238U
b. 242Pu + 4He 246Cm
c. 242Pu 4He + 238U
d. 242Pu 4He + 236U
e. 242Pu + -1b 242N
15. Complete the nuclear equation
177Ta + electron capture by writing the symbol of the missing particle.
a.
177Hf
b.
177W
c.
178Ta
d.
178W
e.
178Hf
16. Complete the nuclear equation 235U + 14N -----> ______ + 5 1n by writing the isotope name for the missing particle.
a.
Pu-249
b.
At-221
c.
At-216
d.
Es-244
e.
Es-249
17. Praseodymium-135 is produced by positron emission from what isotope?
a. Pr-136
b. Nd-135
c. Praseodymium-135 is stable.
d. Ce-135
e. Pr-134
15. Complete the nuclear equation
177Ta + electron capture by writing the symbol of the missing particle.
a.
177Hf
b.
177W
c.
178Ta
d.
178W
e.
178Hf
16. Complete the nuclear equation 235U + 14N -----> ______ + 5 1n by writing the isotope name for the missing particle.
a.
Pu-249
b.
At-221
c.
At-216
d.
Es-244
e.
Es-249
Explanation / Answer
1) most of the elements atomic number greater than 82 are unstable and radiaactive beacuse binding energy per nucleon decreases gradually that is if number og protona and nuetrons are equali then nucie is stable. after 82 atomic number number of nuetrons are exceeds than the number of protons. so that most of the heavier elements are radiaactive and unstable
2) when any element captures the electron its atomic number decreases by one
so 177Ta becomes 177Hf
3) 235U+14N............> 244Es+5n
4) Pr-135.....> Nd-135+positron
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