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Using general trends, predict the stability of the following nuclei.

a. silicon-28
b. arsenic-82
c. radium-228
d. zinc-64
e. potassium-40

Sagot :

Manethoidn

Answer:

stable nuclei are silicon-28, zinc-64 ,  potassium-40

while unstable one are arsenic-82 , radium-228

Explanation:

There is rule to predict stability of a nuclei that is

Z <= 20 N/Z = 1  most stable

Z = 20-40 N/Z = 1.25 stable

Z = 40-80 N/Z = 1.80  less stable

Z >= 83,  nucleus becomes unstable or radioactive

Here, N/Z  = no. of neutrons/ No. of protons

1. silicon-28 , N/Z =14/14 = 1 stable

2. arsenic-82, N/Z = 49/33 = 1.48 (unstable)

3. Potassium-40 , N/Z = 21/19 = 1.10(stable)

4. zinc-64, N/Z =34/30 = 1.13 (stable)

5. radium-228  (unstable, radioactive)

Therefore, stable nuclei are silicon-28, zinc-64 ,  potassium-40

while unstable one are arsenic-82 , radium-228

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