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7. Suppose each of these isotopes emits a beta particle. Give the iso-
tope name and symbol for the isotope that is produced. Place a
checkmark next to the symbol for isotopes that are stable. (Consult
the isotope graph on page 66 of Lesson 14: Isotopia.)
a. potassium-42
b. iodine-131
C. iron-52
d. sodium-24

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In a beta emission, the mass number of the daughter nucleus remains unchanged while the atomic number of the daughter nucleus increases by one unit. The following are isotopes produced when the following undergo beta emission;

1) potassium-42  ------> Ca - 42

2) iodine-131 ------------> Xe - 131

3)  iron-52 ---------------> Co - 52

4)  sodium-24 -----------> Mg -24

The daughter nucleus formed after beta emission is found one place after its parent in the periodic table.

Regarding the stability of the daughter nuclei, a nucleus is unstable if the neutron-proton ratio is less than 1 or greater than 1.5.

Hence, the following daughter nuclei are stable; Ca - 42, Xe - 131, Mg -24.

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