In the PhET simulation, make sure that the checkbox Stable/Unstable in the bottom right is checked. Using the PhET simulation as a reference, determine whether the following combinations of protons and neutrons form stable or unstable nuclei by adding protons and neutrons to the nucleus. Unstable nuclei will shake. If the Stable/Unstable checkbox in the lower right is also checked, the nuclei will be labeled Stable or Unstable. Sort the following combinations of protons and neutrons according to whether or not they form stable or unstable nuclei.

a. 4 protons and 5 neutrons
b. 7 protons and 7 neutrons
c. 2 protons and 3 neutrons
d. 3 protons and 0 neutrons
e. 6 protons and 5 neutrons
f. 9 protons and 9 neutrons
g. 8 protons and 7 neutrons
h. 1 proton and 0 neutrons

In order to be able to answer this question one has to consider the neutron proton ratio. Considering this ratio will allow us to determine the stability of a nuclei. The most important rule that helps us in determination of stability is that when the Neutron- Proton ratio of any nuclei ranges from to 1 to 1.5, then we say the nuclei is STABLE.

Also, we need to understand that when the Neutron- Proton ratio is LESS THAN 1 or GREATER THYAN 1.5, then we say the nuclei is UNSTABLE.

So, let us check which is stable and which is unstable:

a. 4 protons and 5 neutrons = Neutron- proton ratio = N/P = 5/4= stable.

b. 7 protons and 7 neutrons = Neutron- proton ratio = N/P = 7/7= 1 = stable.

c. 2 protons and 3 neutrons = Neutron- proton ratio = N/P = 3/5 =0.6 =unstable.

d. 3 protons and 0 neutrons = Neutron- proton ratio = N/P = 0/3= 0= unstable.

e. 6 protons and 5 neutrons = Neutron- proton ratio = N/P = 5/6= 0.83 = unstable.

f. 9 protons and 9 neutrons = Neutron- proton ratio = N/P = 9/9 = 1 = stable.

g. 8 protons and 7 neutrons = Neutron- proton ratio = N/P = 7/8 =0.875 = unstable.

h. 1 proton and 0 neutrons = Neutron- proton ratio = N/P = 0/1 =0 = unstable

pstnonsonjoku pstnonsonjoku · Answer 2 · 2022-01-27T12:54:39+01:00

A nucleus is unstable if the neutron - proton ratio is less than 1 or greater than 1.5.

The stability of a nucleus depends on the neutron - proton ratio. We must not that an atom is unstable if the neutron - proton ratio is less than 1 or greater than 1.5. Let us now examine each case.

4 protons and 5 neutrons - N/P ratio = 1.25 - stable
7 protons and 7 neutrons - N/P ratio = 1 - stable
2 protons and 3 neutrons - N/P ratio = 1.5 - stable
6 protons and 5 neutrons - N/P ratio = 0.83 - unstable
9 protons and 9 neutrons - N/P ratio = 1 - stable
8 protons and 7 neutrons - N/P ratio = 0.88 - unstable
1 proton and 0 neutrons - N/P ratio = 0 - unstable

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