30.28 Manganese has one stable isotope, 55Mn. What are the likely decay modes an

Question

30.28 Manganese has one stable isotope, 55Mn.

What are the likely decay modes and daughter nuclei for 51Mn?

A)We expect the 51Mn to decay by beta-minus. The daughter nucleus is 51Cr.

B)We expect the 51Mn to decay by beta-plus. The daughter nucleus is 51Cr.

C)We expect the 51Mn to decay by beta-plus. The daughter nucleus is 51Fe.

D)We expect the 51Mn to decay by beta-minus. The daughter nucleus is 51Fe Part B

What are the likely decay modes and daughter nuclei for 59Mn?

A) We expect the 59Mn to decay by beta-minu. The daughter nucleus is 59Fe.

B) We expect the 59Mn to decay by beta-plus. The daughter nucleus is 59Cr.

C) We expect the 59Mn to decay by beta-plus. The daughter nucleus is 59Fe.

D)We expect the 59Mn to decay by beta-minus. The daughter nucleus is 59Cr.

Explanation / Answer

1) we know that

number of protons = atomic number

also

atomic number of Mn is 25

so

number of protons = 25

now

number of nuetrons = mass number - number of protons

so

number of nuetrons = 51 - 25

number of nuetrons = 26

51 Mn undergoes beta - plus decay

the equation is

51 Mn 25 ---> 51 Cr 24 + 0 e 1

so

the answer is option B

2)

59 Mn undergoes beta minus decay

the equation is

59 Mn 25 ---> 59 Fe 26 + 0 e -1

so

the answer is option A

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