Question: In which of the following is the radius of the first orbit minimum?
A H-atom
B Tritium atom
C Triply ionized beryllium
D Double ionized helium
Answer: Triply ionized beryllium
| Names of atom | Atomic Number (Z) | Formula of calculating radius | Radius of the First Orbit |
| H-atom | 1 | r= n2h2 ZKe2
Where ℏ ≈ 1.0545718×10−341.0545718×10−34 J·s k (Coulomb’s constant) ≈ 8.988×1098.988×109 N·m²/C² e ≈ 1.602×10−191.602×10−19 C | Depends on the specific hydrogen atom configuration
|
| Tritium atom | 1 | Depends on the specific tritium atom configuration | |
| Triply ionized beryllium | 4 | Minimum radius of the first orbit | |
| Double ionized helium | 2 | Larger than Triply ionized beryllium) |