Total number of ions from the following with noble gas configuration is :

(Z=38), (Z=55), (Z=57), (Z=82), (Z=70), (Z=26)

Question

Total number of ions from the following with noble gas configuration is :

(Z=38),  (Z=55),  (Z=57),  (Z=82),  (Z=70),  (Z=26)

Canvas Classes · Accepted Answer

Noble gas configurations: He(2), Ne(10), Ar(18), Kr(36), Xe(54), Rn(86)

| Ion | Z | Charge | Electrons | Noble gas? |
|-----|---|--------|-----------|------------|
|  | 38 | +2 | 36 | Kr (36) ✓ |
|  | 55 | +1 | 54 | Xe (54) ✓ |
|  | 57 | +2 | 55 | Not noble gas ✗ |
|  | 82 | +2 | 80 | Not noble gas ✗ |
|  | 70 | +2 | 68 | Not noble gas ✗ |
|  | 26 | +2 | 24 | Not noble gas ✗ |

Noble gas config: Sr²⁺ and Cs⁺ → 2

Answer: 2

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