**Recall:**

• **Z ≤ 20**; the N/Z ratio should be **equal to 1.0**

• **20 < Z ≤ 40**; the N/Z ratio should be **equal to 1.25**

• **40 < Z ≤ 80**; the N/Z ratio should be **equal to 1.50**

• **Z < 83**; the stable nuclide **does not exist**

**a) ^{89}_{42}Mo: 40 < Z ≤ 80; the N/Z ratio should be equal to 1.50**

$\frac{\mathbf{N}}{\mathbf{Z}}\mathbf{=}\frac{\mathbf{89}\mathbf{-}\mathbf{42}}{\mathbf{42}}$** = 1.11**

Classify each nucleus as stable or unstable.

a) ^{89}_{42}Mo

b) ^{118}_{50}Sn

c) ^{30}_{15}P

d) ^{212}_{84}Po

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