Which of the following nuclei is most likely to decay by positron emission? explain your choice.
(a) chromium-53
(b) manganese-51
(c) iron-59

(b) manganese-51

Explanation:

Positron emission or β+ decay is emission of positron from nucleus. It is observed for the nuclides in which ratio to the neutron and the proton is low. These type of nuclides lie below band of the stability. Positron decay is conversion of proton into neutron with emission of positron.

Manganese-51 is most likely to decay by the positron emission.

The n:p ratio:

For Cr-53 is:

For Mn-51 is:

For Fe-59 is:

As stated above, positron decay occurs when n:p ratio is low.

Thus, Mn-51 has the lowest n:p ratio and therefore is likely to decay by the positron emission.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

the answer is c i took the test