Question

Write nuclear equations for positron emission from the following radioisotopes.

Answer 1

for \[_{20}^{38}Ca\]

Answer 2

I have \[_{20}^{38}Ca \rightarrow _{19}^{38}K+_{+1}^{0}e\]

Answer 3

this should be right... idk what is wrong with it

Answer 4

@imqwerty

Answer 5

also tried it this way and it still says its wrong \[_{21}^{38} Cs→_{20}^{38} Ca+_{+1}^{0} e\]

Answer 6

@pitamar

Answer 7

well idk much chemistry, but from what I read in positron emission the atom has one proton that converts to neutron and emits a positron and electron neutrino in the process.. wikipedia ( https://en.wikipedia.org/wiki/Positron_emission ) gives the example of:
$$ ^{23}_{12}Mg \to ^{23}_{11}Na + e^+ + V_e $$ so I guess in your case it is
$$ ^{38}_{20}Ca\to ^{38}_{19}K+ e^+ + V_e $$

Answer 8

Anyway, I have also found the exact same question already answered on openstudy, perhaps that can be more helpful =)
http://openstudy.com/study#/updates/5419c276e4b0d25cee9dd940